Neanderthals are Homo sapiens, not a different species, and may have disappeared because of repeated interbreeding with H. sapiens who emigrated from Africa to Eurasia

August 6, 2026 • 9:45 am

I came across the following post by Professor David Hillis of the University of Texas at Austin, an evolutionist I much admire for his perspicacity and malleability: his ability to contribute to several different fields, including herpetology. (He also breeds longhorn cattle on his Double Helix Ranch in the Hill Country.)  Of course one reason I respect his work is because many of his conclusions agree with mine!

One of them is his adherence to the Biological Species Concept formulated by Ernst Mayr, which basically states that two populations belong to the same species if, when they contact each other in nature, they can produce fertile hybrids. If they can’t for any reason, then they are members of different species. Nearly all evolutionists adhere to some form of the BSC, but I won’t go into the concept in depth as it, its problems and problems with alternative species concepts are covered in detail in my book Speciation written with Allen Orr.

One long-standing question in evolutionary anthropology is whether Neanderthals were a different species from “modern” Homo sapiens.  Some anthropologists say they were different species, the former called H. neanderthalensis and the latter H. sapiens. But there is ample genetic evidence for interbreeding of the two forms in Eurasia, and for fertility of the hybrids, for many people outside of Africa carry Neanderthal genes. I myself have a small fraction of Neanderthal genes in my DNA. This kind of data is prima facie evidence that when the two groups were in contact, that they produced hybrids and also that those hybrids were fertile, backcrossing to modern H. sapiens.

At best, then, I consider the two forms to be subspecies: somewhat differentiated populations that were members of the same species. Those who agree with this, like me and Hillis, see the subspecies as H. sapiens sapiens and H. sapiens neanderthalensis.

The Neanderthals evolved from a hominin population that came to Eurasia out of Africa about 400,000 years ago.  They persisted until about 40,000 years ago, when they (identifiable by fossil features; see below) mysteriously disappeared.

There have been several hypotheses accounting for the disappearance of the Neanderthals. They include demographic fluctuations or inbreeding leading to disappearance of the species, extinction due to inability to survive changes in the environment (there was glaciation when Neanderthals lived), competition (including aggression) from “modern” H. sapiens who left Africa to populate the world about 60,000 years ago, and “extinction through interbreeding”, which is the hypothesis supported by a new paper discussed below in Nature Scientific Reports. I should add that “modern” H. sapiens arose in Africa about 300,000 years ago.

Click both screenshots to go to the comment and the paper.

This paper, by Swiss and Italian authors, shows that “extinction via interbreeding” is at least possible under reasonable and conservative conditions obtaining at the known times of extinction.  Successive waves of H. sapiens coming out of Africa, they posit, interbred with Neanderthals and eventually, because the sapiens were far more numerous than Neanderthals, the Neanderthal genome became absorbed into the modern population of H. sapiens.  Click to read; it’s highly mathematical and you should read just the abstract, introduction, and conclusions:

Here are a few of the assumptions:

  • Neanderthals consisted of tribes of about 500-1000 individuals, subdivided into “bands” of 25-50 individuals.
  • The total population of Neanderthals was about 5000-7000 individuals
  • The population of H. sapiens was ten to a hundred times larger than this
  • Repeated waves of H. sapiens came out of Africa, comprising an effectively infinite reservoir of individuals and genes
  • The genetic data in modern H. sapiens shows repeated instances of introgression

The upshot:  The “genetic dilution” or “extinction through interbreeding” hypothesis can be supported by a reasonable mathematical model that takes into account evidence of population sizes and times of migration, and accounts for the genetic data. This does not mean, of course, that this is why the Neanderthals disappeared. It could have been another scenario or perhaps a combination of this scenario with others. Mathematical models can only tell us what is possible, not what is true.  But the paper does show that an interbreeding scenario cannot be ruled out.

And the genetic data we do have, including ancient DNA data from Neanderthal bones, shows that we and Neanderthals are brothers and sisters: members of the same species. There were other distinct biological species that arose during hominin evolution, but Neanderthals and modern humans were almost surely “conspecific.”

The paper’s conclusions:

The mathematical model we presented provides a plausible explanation for the gradual disappearance of Neanderthals, suggesting that their genetic assimilation with H. sapiens, a demographically much larger species, may have been a significant factor in their decline. Rather than sudden extinction, our model proposes that repeated cycles of H. sapiens immigration leading to the Neanderthal gene dilution, could account for the Neanderthals’ disappearance and the observed patterns of Neanderthal ancestry in modern human populations. Although this model provides a possible robust genetic explanation, it is important to note that it does not exclude other possible contributing factors that were not considered in our approach, such as environmental changes, competition, or demographic fluctuations. Evidence of interbreeding and genetic introgression supports the notion that H. sapiens and Neanderthals interacted extensively over thousands of years. Therefore, the interplay of genetic, demographic, and environmental factors likely contributed to the complex process of Neanderthal demise.

Future studies incorporating both genetic and archaeological data will be crucial in refining our understanding of this pivotal moment in human evolution.

Here’s a Neanderthal skull showing distinctive subspecific features (from Wikipedia):

Jason Potter at en.wikipedia, CC BY-SA 2.5 <https://creativecommons.org/licenses/by-sa/2.5&gt;, via Wikimedia Commons

Thursday: Hili dialogue

August 6, 2026 • 7:00 am

Welcome to Thursday, July 6, 2026, and it’s Hiroshima Day, the anniversary of the day in 1945 when the U.S. dropped an atomic bomb on the city of Hiroshima.

On August 6, 1945, at 2:45 a.m., the Enola Gay, a B-29 bomber, took off from Tinian Island in the Mariana Islands. It was flown by Lt. Col. Paul W. Tibbets—who had named the plane after his mother—and carried an atomic bomb called “Little Boy.” At 8:16 a.m., the bomb was dropped over the city of Hiroshima. It exploded at an altitude of 1,900 feet, above a hospital. It released the equivalent of 12,500 tons of TNT and destroyed over four square miles of the city, leveling about 62,000 of Hiroshima’s 90,000 buildings. Around 80,000 to 90,000 people were killed on impact, and another 60,000 died by the end of the year on account of radiation sickness and other injuries sustained from the blast.

Here’s a BBC dramatization (for an excellent historical documentary with contemporary filming, see here). Save for the bomb dropped on Nagasaki three days later, this was the last nuclear weapon used in a war. Fingers crossed that it won’t happen again (we’re looking at you, Iran):

It’s also National IPA Day (i dislike the spread of this beer’s popularity, as it has no flavor save that of hops), and National Root Beer Float Day (a much better tipple).

Readers are welcome to mark notable events, births, or deaths on this day by consulting the August 1 Wikipedia page.

Da Nooz:

*Well, “progressive” candidate Abu Al-Sayed won the Democratic Senatorial primary election in Michigan, by about one percentage point.

Dr. Abdul El-Sayed, a progressive and a vocal critic of Israel, edged Representative Haley Stevens, a moderate, early Wednesday to narrowly win the Michigan Senate Democratic primary, according to The Associated Press.

It was a high-profile victory for the ascendant political left — though the rancorous race was ultimately far closer than polls had suggested, with Dr. El-Sayed leading by less than a percentage point Wednesday morning. Dr. El-Sayed will face former Representative Mike Rogers, a Republican, in a general election clash for an open battleground seat that could determine control of the Senate.

On Wednesday morning, Dr. El-Sayed and Democrats from across the ideological spectrum moved quickly to project party unity after a remarkably bitter and expensive primary campaign.

Speaking at a rally, Dr. El-Sayed hailed Ms. Stevens as “one of the most committed public servants” and said there was far more that united them than divided them. Seeking to appeal to both Republicans and Democrats, he also urged voters to support him if “you believe like me that you ought to be able to afford your groceries.”

Ms. Stevens called Dr. El-Sayed on Wednesday morning to concede the race, a spokesman for her campaign said.

Dr. El-Sayed and his allies argued that his populist rhetoric would energize voters across the political spectrum who are unhappy with the status quo, and he plainly tapped into simmering Democratic fury with the party establishment, and with President Trump.

But many Democratic leaders had rallied around Ms. Stevens, a centrist, fearful that the left-wing views espoused by Dr. El-Sayed, a former public health official and proponent of universal health care, could imperil the party’s chances of defending an crucial open seat.

The Michigan Senate primary now marks the most significant triumph for the political left this year — and the general election there could pose the movement’s biggest test yet, measuring whether left-wing candidates can energize enough voters to beat Republicans in swing terrain.

The Senate primary was defined by fierce debates over Israel. Dr. El-Sayed overcame $60 million in outside money supporting Ms. Stevens, including about $32 million from the American Israel Public Affairs Committee, a major pro-Israel group whose involvement became a source of frequent conflict in the contest.

I see this campaign as somewhat as a referendum on Israel, with supporters of Israel losing.  To me, El-Sayed is the Senate equivalent of Rashida Tlaib or Ilhan Omar, but, if elected, he’ll have more power than either of them. What are the Democratic voters thinking—to elect a guy like this over a moderate Democrat? It’s very depressing. I’d put a black border  of mourning around this item if I could.

*I am surprised that the U.S. is using the Oman/Iranian negotiations over the Strait of Hormuz as a way to settle our own dispute, but the WSJ notes that “Iran stakes everything on controlling the Strait of Hormuz.

Iran and Oman have agreed on the geographical coordinates of a proposed safe shipping route for commercial vessels in the Strait of Hormuz, Iranian Foreign Ministry spokesperson Esmaeil Baghaei said Wednesday.

The two countries have held talks over the past two months covering the technical, legal, security and environmental aspects of the proposed route, Baghaei said in response to questions about the talks.

Baghaei described the negotiations as “professional” and “progressing,” adding that a joint statement setting out the main points of agreement is being reviewed and finalized.

“Provided that certain third parties do not obstruct the process, the joint statement of the two countries, including the principal considerations and points of agreement, is also in the final stage of review and drafting,” he said.

Baghaei blamed the closure of the strait on the US and Israeli attack on Iran. He said an agreement between Iran and Oman alone could not guarantee safe passage while a US naval blockade and “other aggressive and threatening actions” remain in place.

From the WSJ:

Iran’s leadership has made a high-stakes calculation in its showdown with President Trump: maintaining control over the Strait of Hormuz is a nonnegotiable red line.

By asserting authority over a critical waterway for global crude-oil flows, Tehran is betting that its ability to inflict pain on the American economy is its best leverage to avoid future military action from the U.S. and Israel. With gasoline prices and inflation elevated, Tehran believes Trump will ultimately accept its terms ahead of fast-approaching midterm elections that could determine the future of his presidency.

Centering strategy on controlling the Strait of Hormuz is an extraordinary gamble. It assumes Trump will prefer a messy, volatile stalemate over an all-out war. In playing this card so aggressively, Tehran risks miscalculating Washington’s breaking point and threatening its own economic survival.

“Their maximalism will contribute to their isolation in the long run,” said Behnam Ben Taleblu, an Iran expert at the Foundation for Defense of Democracies, a policy organization that opposes Iran’s rulers.

There are fissures from within Iran’s government on control of the strait.

The hard-line Islamic Revolutionary Guard Corps sees the control of Hormuz as its most important tool to exert pressure on the West following the degradation of its nuclear program and its militia proxies over the past few years, said Iranian and Arab officials and a Revolutionary Guard adviser. The Iranian military has suffered major losses since the U.S. and Israel launched a surprise attack on Feb. 28, but it has been able to bog Washington down by harrying shipping in the strait and targeting U.S. assets in the Persian Gulf.

If any ships have to pay one red cent in tolls (disguised as “monitoring costs” or something else) to Oman or Iran, the Strait will not have reverted to its pre-war condition, and Trump’s big demand will have failed. Iran is committed to having some control over the Strait, just as its committed to making nuclear weapons. Trump needs to understand this. He might already, but be ready to just withdraw and proclaim victory.

*Ukraine is in trouble as Russia has shifted from a war largely on the ground to a war almost entirely in the air, and Ukraine is running out of interceptor missiles.

Ukrainian forces failed to shoot down a single Russian missile early Wednesday during Moscow’s latest aerial bombardment of Kyiv and the surrounding region — a consequence that President Volodymyr Zelensky blamed on a plunge in anti-ballistic systems supplied by its partners, including the United States.

Zelensky wrote on X that 17 people were killed and 44 injured, adding: “Ballistic missile interceptors could have saved the lives of those killed today. It is very important that our partners understand that delays in supplying them, or an unwillingness to provide anti-ballistic systems, lead directly to such horrific casualties and destruction.” In a separate post Wednesday, he said that the number of air defense missiles supplied by partners “has dropped threefold compared with 2025.”

“Our partners do have the missiles,” Zelensky wrote. “It is important that the necessary political decisions on supplies and the acceleration of production processes are ultimately made.”

It was the third major ballistic attack on Kyiv in a week, and came only days after Zelensky warned that his country had run out of air defense interceptors. Russia launched 24 ballistic and four hypersonic cruise missiles overnight, along with 115 attack drones, most of which targeted the area outside of Kyiv, Ukraine’s Air Force said on social media. All of the missiles and 17 drones struck targets.

Russian forces also appear to be expanding their list of civilian targets to include Ukraine’s major supermarket chains.

In a statement posted on social media, Russia’s Defense Ministry said it carried out a “massive strike” that resulted “in the destruction of transportation, logistics, and distribution centers in the city of Kyiv and the Kyiv region.”

Ukraine relies on the U.S.-designed Patriot air defense systems as its only means to shoot down Russian ballistic missiles, and until recently, a large number were intercepted. However, the system’s interceptor missiles are in short supply, in part because of the large number used during the Iran war.

EU countries have some Patriots, but they don’t want to give them to Ukraine because they don’t want to weaken their own defenses. This is misguided; no other country in Europe is imperiled, and Ukraine is clearly the subject of a new Russian strategy to target civilians. That’s a war crime, of course, but do you hear people calling it out? I don’t think so.  As I see it, we have a moral obligation to help Ukraine, an ally, as much as we can, even if we have to sacrifice something to do so. Putin will be heartened at the lack of U.S. and European help for Ukraine, and I wouldn’t put it past him to try invading more countries.

*At the Free Press, Yuan Yi Zhu discussed the Cambridge University fabulist in “Who had to lose for Jason Arday to win?” (Note previous post reporting that Arday resigned after this was published.)

There had been suspicions concerning Arday’s research for many years, but journalists and scholars who tried to investigate the issue were scared off by letters from one of England’s most fearsome libel law firms (who paid the firm is unknown), and some were reported to the police for harassment.

As the furor began, Arday and his allies initially accused his critics of racism and tried to portray him as the victim of a “lynch mob,” but he has admitted that he had made “mistakes” in his work, blaming it in part on his autism. An open letter in his support (which, contra Arday’s own words, claimed that his work was entirely beyond reproach) attracted thousands of signatures, including those of at least nine British legislators and that of acclaimed autism researcher Sir Simon Baron-Cohen, who accused Arday’s critics of potentially pushing him into suicide.

. . . Last week, as the uproar built and more and more outlets covered the story, The Guardian, which one might expect to be sympathetic to Cambridge’s argument that this was a race-based witch hunt, subtly took apart these claims one by one. The reporting led to an anguished complaint from Arday that “To be honest with you, I thought you’d just believe me.”

How did Arday get away with it for so long? There are many fantasists and cheats out there, but most do not reach the top of their profession. Academia, which prides itself on the rigor of our selection process (a process that is, in many ways, ritualized hazing), should have prevented him from achieving his exalted rank. In a context where a temporary entry-level job can attract as many as 800 applications, any flaw can be used to disqualify a candidate.

But the system failed. At every stage, Arday was waved through and showered with praise. His PhD supervisor allegedly held one formal supervision only with him during his course, which did not prevent him from hiring Arday for his first academic job. The University of Glasgow appointed him to his first chair in 2021, when he was 36 (Stephen Hawking got his first chair at the age of 35).

Then, after stints at several universities of increasing repute, he ended up at Cambridge. Normally, elections to Cambridge chairs are announced with a notice pinned to a notice board in the center of the city, followed by a note in the university’s internal newspaper. In Arday’s case, news of his appointment was splashed on front pages and homepages across the world. The story was simply too good to pass up, especially in the post-2020 racial reckoning.

The breathless release put out by Cambridge’s education department described him as “a leading scholar in his field” who “publish[ed] extensively,” both standard requirements for any senior academic post. But it also spoke of his role as “a platform he intends to use to inspire more people from underrepresented backgrounds into higher education, building on the university’s many initiatives in this area.”

It is hard to escape the impression that Cambridge wanted him as a visible symbol of its commitment to diversity, overlooking in the process his suitability for the job. He was, in blunter terms, hired to be the face of Cambridge’s diversity drive. Whether his work was any good or not was beside the point. He represented something that Cambridge wanted to show the world, and that was that.

It’s considered offensive to say that someone is a “DEI hire”, but that’s exactly what Zhu is saying here, and that’s what it looks like more and more every day. I wonder if Cambridge will fire the guy for plagiarism (his Ph.D. school exculpated him), and for serial lying (they can hardly fire him for poor scholarship, but if some of that is stolen, then yes, it’s unethical). I think he needs to be let go because he’s already painted a past that’s grossly wrong, I doubt he’s a substantial resource at Cambridge, and the whole story above is a slap in the face to serious scholars of color—at Cambridge and elsewhere.

*The NYT reports on the latest fad diet: “steak and sauerkraut”, really beefy meat and fermented foods. It’s not as unhealthy as it sounds!

I was a little less than 30 minutes into a video call with Sean O’Mara, the trim and handsome 63-year-old doctor who has reportedly been giving dietary advice to several members of the Trump cabinet, when he pulled up an image of two liquids the color of radiator fluid. This vibrant yellow-green, O’Mara explained, occupies a specific attention-getting wavelength. “Soda companies use that color to get people to buy,” he said, gesturing to the first liquid, which was Mountain Dew. “Your brain kind of lights up. You’re like, Wow, that’s cool stuff.” He directed my attention to the other liquid, roughly the same color, and in a jar.

“Do you know what that is?” he asked me.

“No,” I said.

“That’s urine,” he said. “That’s urine from a human being.”

The strong implication was that it was his. Passing urine this color is a good thing, O’Mara said, and it started happening to him six years ago: a byproduct of his diet, which comprises almost exclusively steak and fermented foods. The Wall Street Journal reported in June that Robert F. Kennedy Jr., JD Vance, Howard Lutnick and Sean Duffy had all taken up the O’Mara program. Kennedy has credited it with reducing his visceral fat load by 40 percent; the president has reportedly taken notice of Vance’s slimming figure.

. . .So I joined the cabinet — for a week, anyway.

O’Mara calls it the Living Diet: You eat nothing but the flesh of grass-fed ruminants — cows, yes, but also bison, elk and venison — and as many different fermented foods as possible, because their bacteria help repopulate your gut, which he says improves your metabolism, leading to weight loss. Wild-caught seafood is cool, too, but ruminants are best, O’Mara says, because they ferment what they eat in their many stomachs.

He wanted me eating fermented beets, carrots and radishes; Roquefort and Parmesan; yogurt, kefir and kvass. He showed me a picture of his typical plate of food: It looked as if a steak had been dropped on a painter’s easel, studded as it was with multihued hillocks of fermented vegetables. “I have a refrigerator that has about 20 to 30 ferments, and I just get little bits of each one,” he explained. “I’m just rubbing this meat around in all that bacteria.”

. . . I ran the basics of the diet by Marion Nestle of New York University, whose views on nutrition are more mainstream than O’Mara’s. While she questioned his claims about fermented foods improving metabolism, Nestle agreed the diet would be effective as a temporary route to weight loss, provided you kept your caloric intake below maintenance. “I can’t think of any nutrients that would be missing from this,” she said. “But it just sounds boring to me.”

. . .To O’Mara, the diet is not just a temporary means of losing weight but a way to eat for good. He has been doing it for 10 years, and credits it with turning his life around. At one point in our conversation he pulled up the Bristol Stool Chart, which ranges from Type 1 (“separate, hard pellets”) to Type 7 (“watery, no solid pieces”). O’Mara is consistently delivering Type 4 (“smooth, soft, like a snake”), with pointed ends, indicative of healthy rectal function, he told me. “When you start eating healthy, you don’t need toilet paper,” he claimed. “Animals in the wild have no residual stool on their anus.” He described a proper bowel movement to me this way: odorless, wipe-free, over in three to seven seconds and “nearly orgasmic.”

“I could have a bowel movement behind a sheet at a dinner party in the corner of the room,” he said, “and nobody would know.”

Oy gewalt! I was surprised to learn that this diet won’t kill you, but is it that different from the diet of our ancestors? (Presumably their herbal and dairy stuff may have been somewhat fermented.) But we keep learning that what we “knew” about diets has been wrong.  I probably eat a bit more ruminant meat (steak) than most readers here, and I do eat yogurt, but I don’t have access to venison or bison, and there’s a dearth of fermented food in the rest of my diet? Will I change it in light of this article? Probably not—it’s boring.

Meanwhile in Dobrzyn, Andrzej and Hili discuss the origin of a very important species.

Hili: When did cats domesticate humans?
Andrzej: According to archaeologists, about nine and a half thousand years ago.
Hili: That’s only a theory. The beginnings of civilization are certainly older.

In Polish:

Hili: Kiedy koty udomowiły ludzi?
Ja: Zdaniem archeologów około dziewięć i pół tysiąca lat temu.
Hili: To tylko teoria, początki cywilizacji z pewnością są starsze.

*******************

From Marlene Burns:

From Meow Incorporated:

From FuFu’s Cat House:

From Masih. Read the whole thing; she’s absolutely correct about how to construe “choice”. And what a way to swim!

The Number Ten Cat is the acting Prime Minister of the UK!:

From Malcolm, a very trusting moggy:

More on Jason Arday (via Luana). His deeds involved more than plagiarism, this person says, but also outright fraud. Click screenshot to go to tweets:

Two from my feed. First, a bovine mountain:

Crikey, my feed is filled with stuff about Jason Arday. Here’s one more; you might want to read the original article about how Arday used the cops to defend himself against  academic and journalistic inquiries:

And one I reposted at The Auschwitz Memorial:

From Dr. Cobb, who’s writing about the history of heredity. This is a real find. English translation:

Prelate Cyrill Napp briefly summarizes the course of the debate thus far and concurs with the view expressed by Director Liehr, pointing out that the discussion has strayed entirely from the actual subject—heritability; the issue at hand is not the theory of the breeding process, but rather the question: What is inherited, and how?

One of the most important questions in the history of biology, posed during an 1837 discussion of agricultural breeding in Brnö by Abbé Cyrill Napp, the man who recruited Mendel: "What is inherited and how?" (Transliteration, translation, reference and source in Alt)

Matthew Cobb (@matthewcobb.bsky.social) 2026-08-05T13:55:01.926Z

Jason Arday resigns his professorship at Cambridge

August 6, 2026 • 6:30 am

As I reported two days ago, Cambridge sociology professor Jason Arday was the subject of several reports of unethical behavior as well as fabulism.  Yesterday he resigned his position at The University of Cambridge after there were multiple credible accusations of plagiarism in his Ph.D. thesis and his scholarly papers (which didn’t seem so scholarly). He also told unbelievable tales about his life, including having raised £5 million pounds for charity, of having run 30 marathons in 35 days, and of having been threatened when there was no evidence of the reported threats. He sicced the police on journalists inquiring about his life, and blamed all the inquiries and criticism on racism.  He said that he was diagnosed as autistic when young, did not speak until he was 11 years old, and could not read or write until he was 18.

The pressure on Arday grew sufficiently intense, and the accusations so numerous, that Cambridge finally announced they were investigating him. In light of this and other mounting investigations, he quit his job (see his resignation letter below); all this is reported in the New York Times (here and here; links free, h/t Keith) and the Guardian. His autobiography, scheduled to appear this coming week, is apparently still in the works, but I suspect it will be withdrawn. From the NYT:

His resignation came hours after Cambridge announced an investigation into Arday, and six days before the scheduled release of his memoir “Great and Unfortunate Things,” by the Simon & Schuster imprint 37 Ink, in the United States.

A representative of Simon & Schuster, which has so far stood by the book, told The New York Times on Wednesday that the publisher had no comment beyond the statement about Arday it released last week, citing “the professionalism and integrity he has brought to every stage of the publication.”

Arday, true to form, did not admit any fabulism or guilt in his resignation letter posted at the GoodLaw Project:

Dear colleagues,

It is with profound sadness that I write to resign, with immediate effect, from my position at the University of Cambridge and Jesus College.

When I accepted the extraordinary honour of becoming Professor of Sociology at Cambridge, it was, without question, the greatest professional privilege of my life. To become the youngest Black professor in the University’s history was something I could scarcely have imagined as a child growing up with a diagnosis of autism, unable to speak until I was eleven years old.

The response from so many people across the world was overwhelming. Thousands celebrated not simply my appointment, but what it represented: that talent, perseverance and hope can triumph over even the greatest adversity. It has been the privilege of my life to teach my students, to learn alongside them, and to witness their curiosity, kindness and ambition. They have given me far more than I could ever have given them.

Sadly, the years since my appointment have also been marked by an unrelenting level of public scrutiny and personal attack. While criticism is an inevitable part of academic life, what I have experienced has gone far beyond scholarly disagreement. The relentless accusations, speculation and public commentary have taken a profound toll on me and on those I love.

I have tried to continue because I believe deeply in the values of higher education, in rigorous scholarship, and in the transformative power of universities. I have tried because of my students, my colleagues and the countless people who have written to tell me that my journey gave them hope.

But there comes a point when the personal cost becomes too great.

I have a family. I want to be present for them. I want to reclaim some peace, some privacy and some semblance of an ordinary life. I no longer wish to feel as though I am living under a constant spotlight, where every aspect of my life is subject to public examination and judgement.

For my own wellbeing, for my family, and for those who have stood by me throughout this difficult period, I have concluded that the only way to bring this chapter to an end is to step away.

This decision should not be interpreted as a loss of faith in scholarship or in the values that first brought me to Cambridge. Nor should it be mistaken for an acceptance of the narratives that have surrounded me. It is simply the decision of someone who has reached the limits of what any person should reasonably be expected to endure.

To my students: thank you. Teaching you has been the greatest honour of my academic career. Your brilliance, compassion and determination give me enormous hope for the future.

To my colleagues and to the many thousands of people, from every corner of the world, who have supported me, defended me, written to me, and believed in me when it mattered most, I offer my deepest gratitude. Your kindness has carried me through some of the darkest moments of my life.

This is not the end of my work. It is simply the end of this chapter.

I need time to heal. I need time to simply be  myself again.

And when that time comes, I will return.

I will return stronger, wiser and with the same determination that has always defined my journey. There is still so much work to do, and I look forward to doing it alongside so many of you in the years ahead.

For now, however, I ask only for understanding, for compassion, and for the space to begin again.

With gratitude,
Professor Jason Arday

Again, he admits no guilt, but implies that “relentless accusations”, which he’d always attributed to racism or ableism, had made his life at Cambridge Uni intolerable.  I feel a bit sorry for the guy, for, after all, his rise was promoted by people who bought into the oppressor/victim narrative. But he himself is responsible for telling apparently false stories about his academic career and life, and for stealing from other scholars. As I said, Arday’s meteoric rise, as well as the many people who defended him in light of credible accusations, constitute an insult to reputable black and minority scholars everywhere.

I doubt Arday will return to academics, for what university would hire him? He is tainted permanently, and the plagiarism and statements about his life are there for all to see. Let this be a lesson to Cambridge to hire solely on the basis of merit rather than to tick an identity box.

Here’s the take of philosopher Maarten Boudry; read the whole thing, and watch the video at the end:

My eponymous bufonid has been made part of a high-profile conservation campaign

August 5, 2026 • 11:00 am

The ponderous title above was from Greg Mayer when he emailed me the information below. To wit: there is a new project, called the Phoenix Species project, which is described at its own site, at re:wild, and in the New York Times. It is a great project, has targeted 100 very endangered species for saving, and does not involve Colossal trying to “de-extinct” species via genetic tweaking,

From the Phoenix page:

The Phoenix Species Project is a global effort to recover 100 of the world’s most threatened species by providing sustained support for the local champions with the experience and knowledge to lead their recovery.

The project begins with a $200 million commitment, with $100 million from Leonardo DiCaprio’s Re:wild and $100 million from the Bezos Earth Fund, with support from Leonardo DiCaprio, Age of Union, and the Todd Graves Family Foundation. The project’s 100 species span mammals, amphibians, reptiles, birds, fish, invertebrates, and plants from 30 countries that live across a range of habitats, from oceans to freshwater lakes, tropical rainforests to volcanic plains.

Here’s a short video about the Project:

You can see the species chosen for special funding at this site.  The NYT says this:

The hundred species were chosen because they were near extinction, had local organizations already working to save them and represent a diversity of habitats, countries and types of species.

. . . For the fuzzy belly button plant, a succulent that has lost more than two-thirds of its population to harvesting since 2019, when it became very popular abroad, the money will allow conservationists to breed more plants in captivity, buy trail cameras for security and fund work with communities so the plant can be returned to the wild without getting overharvested again, said Domitilla Raimondo, the threatened species program manager at the South African National Biodiversity Institute.

“They’re not as charismatic as a panda bear or a rhino, so they don’t tend to get the love and attention that other species get,” she said. “What is really great about this Phoenix recovery plan is it’s giving equal love to different species.”

Still, it includes only three invertebrates, among them a snail in Tahiti, and no insects.

Vivek Menon, chair of the Species Survival Commission at the International Union for Conservation of Nature, said the 100 species were a “fantastic first step” and emphasized the need to scale quickly.

More than 11,000 species are classified as either critically endangered or extinct in the wild on the I.U.C.N. Red List, the leading global scientific authority on the status of species. Almost 40,000 more are endangered or vulnerable.

That averages out to $2 million per species, a goodly amount. Greg sent me this information because one of the targeted species, shown below, is my very own frog, Atelopus coynei, which my late friend Ken Miyata and I collected in the coastal rain forests of Ecuador in 1976 (it now has its own Wikipedia page, and you can see all my posts on this story here.).  Ken named it after me because, when we were in graduate school at Harvard’s Museum of Comparative Zoology, he ran out of dough and I loaned him $500.

From the paper giving the description in Breviora:

And Ken’s note about the origin of the species name:

For many years I thought A. coynei had gone  completely extinct, but a population was discovered in Ecuador by Andreas Kay in 2012, and now there are several disjunct populations in Ecuador. One is where reader Lou Jost lives and works (the Dracula Reserve described below). I see it’s been given the common name Río Faisanes Harlequin Toad. And I had no idea that the world population is down to 250 individuals. From Wikipedia:

It currently found in only four disjunct areas in Carchi Province, including two locations in Río Chinambi and the Dracula Reserve, a private protected conservation area in Carchi Province, north-western Ecuador, which was established through the effort of the Rainforest TrustEcoMinga Foundation, and Orchid Conservation Alliance.

Click on the screenshots to go to the Phoenix page:

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Another photo from the Dracula Reserve, this taken by Juan Pablo Reyes and Jordy Salazar/EcoMinga. The frog is much prettier than the photo above suggests, with lime green spots on a brown body, jazzed up with white racing stripes:

From the Phoenix site:

The Río Faisanes Harlequin Toad is a small amphibian that lives in the high-altitude cloud forests of the Ecuadorian Andes. The species is rare, and scientists have only ever found it in a handful of spots. In 1976, scientists described the species from a subpopulation the Río Faisanes River, the species namesake. Now, scientists think that the species likely only lives in two places. One is in the municipal protected area ACUS Río Chinambí and the other is the privately protected Dracula Reserve. Both localities are in Carchi province.

The disease chytridiomycosis and the degradation of the Río Faisanes Harlequin Toad’s forest habitat from agriculture, logging and human settlements have caused dramatic declines in the species. The toad was even lost to science from 1984 until 2012, even though scientists had tried searching for it.

The Río Faisanes Harlequin Toad is active during the day, especially in the rain, where it spends most of its time along the rocky river banks and stream beds. At night the toads will move to leaves that overhang the water. When it comes time to breed, the species lays eggs in fast-flowing streams and rivers attached to rocks.

I see I’m being solipsistic, concentrating on only one species out of 100.  Forgive me, but I’m glad there’s money for them all. It’s a good project, but if you read the NYT, you’ll see the paper beefing about how Amazon, which donated half the money, is responsible for environmental degradation. But let’s hope the money does help to save some of these critically endangered species, especially the eponymous bufonid

Jesus and Mo lagniappe

August 5, 2026 • 9:30 am

Another Jesus and Mo strip today, this timecalled “less“. Such largesse!  It came with a joke:

Today’s joke comes from the prophet Mohammed himself as recorded in Sahih Bukhari 304, which I will transcribe here for your pleasure:

Once Allah’s Messenger went out to the Musalla (to offer the prayer) of `Id-al-Adha or Al-Fitr prayer.

Then he passed by the women and said, “O women! Give alms, as I have seen that the majority of the dwellers of Hell-fire were you (women).”

They asked, “Why is it so, O Allah’s Messenger?”

He replied, “You curse frequently and are ungrateful to your husbands. I have not seen anyone more deficient in intelligence and religion than you. A cautious sensible man could
be led astray by some of you.”

The women asked, “O Allah’s Messenger! What is deficient in our intelligence and religion?”

He said, “Is not the evidence of two women equal to the witness of one man?”

They replied in the affirmative.

He said, “This is the deficiency in her intelligence. Isn’t it true that a woman can neither pray nor fast during her menses?” The women replied in the affirmative.

He said, “This is the deficiency in her religion.

And once again Mo literally begs the question!

Jesus ‘n’ Mo ‘n’ faith

August 5, 2026 • 9:00 am

There’s a new Jesus and Mo strip called “defender”, which came with a note:

It’s King Charles III! He’s not the brightest.

Not much in the media about this.

The link goes to an article from the National Secular Society called “The Monarchy’s rebrand can’t hide Christian privilege.” A short excerpt:

The Telegraph this week made much of what it portrayed as an important evolution in the King’s constitutional role.

In the latest Sovereign Grant report, King Charles is no longer described simply as “Head of the Church of England and Defender of the Faith”. Instead, as Supreme Governor of the Church of England, the Monarch now “protects the space for Faith within the multi-faith nation”.

Predictably, some Christian nationalist voices reacted as though the monarchy had abandoned Christianity altogether. Others hailed the change as evidence of an institution embracing Britain’s religious diversity.

Neither reading holds up. The change in language is not evidence that Britain’s Christian monarchy has become more inclusive. It is evidence that the Palace knows Christian privilege is becoming less palatable to the British public.

The strip (below) is good, what with the barmaid’s joke.

Oh, and some advertising. Note that I wrote the foreword for the latest book:

Why not become a patron of J&M by applying here?  Your support is much appreciated: or buy a book? – The latest J&M collection of J&M strips, which has a foreword by Jerry Coyne, is available here:

Peace and blessings,
Author J&M

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Readers’ wildlife photos

August 5, 2026 • 8:15 am

We have only a few batches left, and I am baffled about why few submissions are coming in. Please, if you have photos and appreciate this site, send me some good ones. Thanks!

Today’s photos come from Marcel van Oijen in the Netherlands. His captions and IDs are indented, and you can enlarge his photos by clicking on them.

A Dutch Garden in Summertime

Marcel van Oijen

This summer we spent two weeks in the Netherlands, looking after the house of Nellie and Roel who count as both family and close friends. The following nine pictures were taken in their garden in the small town of Woudenberg, in the central Dutch province of Utrecht. Even though the Netherlands are just 700 km away from us (we live in Scotland on the opposite side of the North Sea), temperatures were about ten degrees higher there which made for much more varied wildlife.

This is a Willow Emerald damselfly (Chalcolestes viridis), recognisable from its brownish eyes. We never see damselflies or dragonflies in our garden here, so this was a huge and pleasant surprise:

Small White butterfly (Pieris rapae). Very common on both sides of the pond:

Vagrant Darter dragonfly (Sympetrum vulgatum). The species can be identified from its yellow-black legs, and its overall yellow colour tells us it’s a female;

Red Admiral (Vanessa atalanta). A very common butterfly also here in Scotland:

Another Pieris butterfly, a Green-veined White (Pieris napi). I find the various Whites often difficult to photograph because they are so restless, but here they took their time feeding, maybe because the heat was too much even for them, or the flowers contained more nectar than usual?:

This European Garden Spider (Araneus diadematus) was a joy to follow during our days in the garden, when it was making or repairing its web, or scurrying toward the foliage whenever I got too close. Here it is wrapping up some prey (a hoverfly perhaps) for dinner later.

The sky was not really this featureless white, but I overexposed this picture of a Blue Tit (Cyanistes caeruleus) by two stops to make the picture look somewhat like a Chinese print:

And here is its larger cousin, a Great Tit (Parus major), with tiny prey:

We finish with one of the most common hoverflies in Europe, a Marmalade Hoverfly (Episyrphus balteatus). This photo was taken while sitting at the breakfast table in the garden, where they would be hovering near the same flowers every morning, so I could focus the camera first and then simply wait for one of them to appear in the right spot: