Readers’ wildlife photos

July 10, 2020 • 7:45 am

Today we have installment #2 of Mark Jones’s photographs (#1 was yesterday). The photos document the return of the stork to England. You can read about their comeback in this article, which notes that the species hasn’t bred in England for hundreds of years: the last documented breeding was in fact in 1416! Yet everyone loves storks, and the conservationists’ goal is to get thirty pair breeding in nature by 2030.

Mark’s words are indented:

It is over 600 years since we have had white storks (Ciconia ciconia) in England, so imagine my excitement when, as I was photographing one of my favourite trees near my home, three of them flew down and landed on it! We just don’t see birds this size in Sussex, so it came as a bit of a shock. A complete stroke of luck, and I was also testing a new 300mm lens at the time.

These storks come from a rewilding project at Knepp Castle (, which is having a bit of success at the moment with some chicks being raised and drawing the sightseers. But this is the first time I’ve seen them in Rudgwick (about 10 miles from Knepp as the stork flies). If you look closely you can see that all the storks are ringed, with a GB ‘number plate’.

Anyway the lens performed reasonably so I hope you like this selection.

Incidentally, for more context this is the tree that I was making a long exposure photo of; now with added storks.


Trump administration weakens Endangered Species Act

August 13, 2019 • 10:00 am

Everything the Trump administration does seems aimed in the wrong direction, but as a biologist, I’m really pissed off at this latest bit of stupidity. Read the NPR or NYT articles below (click on screenshots) to see the latest debacle:


Here are some of the changes. The new regulations:

  • weaken protections for species listed as “threatened”: one step below “endangered”;
  • allow future listings to be based partly on economic assessments (the NYT says, “for instance, lost revenue from a prohibition on logging a critical habitat”) rather than on science alone. This is a first, and something the original Act aimed to avoid.
  • make it easier to remove species from the “endangered” list;
  • limit the nature and amount of habitats are considered when deciding whether a species is listed as “endangered”. Environmental groups claim that this will make it harder to protect species at risk from warming climates, which alters where they live and how much space they occupy; and
  • give the government a lot more discretion about interpreting the phrase “foreseeable future” when deciding whether to list species. This would allow the government to largely ignore impending threats to species’ existence, one of them being climate change. In other words, what could happen in the future can be ignored when deciding which species to save.

The Trump administration claims that this will “help conservation efforts” (Interior Secretary David Bernhardt) and “ease the regulatory burden on the American public, without sacrificing our species’ protection and recovery goals” (Commerce Secretary Wilbur Ross). Those are, of course, lies. This is not about conserving species, but about making it easier for ranchers, oil drillers, and developers to take over land at the expense of its animal and plant inhabitants. Not a single change increases protection for species.

The motivations for this change are transparent, and become even more transparent when you see that, as NPR reports, “Republican lawmakers and industry groups celebrated the revisions. . . .”  Frankly, the government’s defense of these changes, which are a pack of lies, and its refusal to even acknowledgethe real motivations, sicken me. This is just one more REM bout in the continuing nightmare that is Trump.

But not everyone is going gentle into this bad plight. According to the Associated Press, both Maine and Massachusetts, along with several conservation groups, said they’ll sue the government over these latest changes. Should we sign petitions? See the next post.

h/t: Ken

Giant stick insects to be re-introduced to Lord Howe island

June 6, 2019 • 12:00 pm

Seven years ago (that long???!), I wrote about the giant stick insects (phasmids) found on a pinnacle of rock (“Ball’s Pyramid”) near Lord Howe Island, which lies between New Zealand and Australia. (See the posts here, here, and here.) Lord Howe is an oceanic island—the remnants of an ancient volcano—and home to many endemic species of plants and animals.  As I wrote earlier:

I’ve written twice before about Drycoceocelus australis, the giant stick insect of Lord Howe, an isolated volcanic island in the South Pacific (see here and here). The beast was once thought to be extinct, but climbers found 24 on Ball’s Pyramid, a jutting vertical spire of rock about 8 km from Lord Howe. They’re “YUUUJE,” as Philomena would say: up to six inches long and weighing nearly an ounce. They look like this, showing why their nickname is “tree lobsters”:

Male Lord Howe Island Stick Insect

Here’s Ball’s Pyramid, where the insects were found by explorers in 1964. As the Pyramid was  part of the volcano that created Lord Howe Island, and only 23 km away, the stick insect was once numerous on Lord Howe, too, though it was wiped out by 1920 by a combination of fishing (they were used for bait) and rodent invasion.


Although the insects were thought to be extinct after 1964 on Ball’s Pyramid as well, climbers in 2001 found a small population—only 24 stick insects. These were recovered and brought to Melbourne to expand the population for possible re-introduction on Lord Howe, as described in this post and the video below:

But reintroduction wouldn’t work on Lord Howe so long as there were rodent predators there. So, hand in hand with the captive breeding program, a process of rodent extirpation is now planned to begin this year, as described in this news piece in Science (click on the screenshot):


From the article:

. . . the Lord Howe project, years in the making, “will be the largest rodent eradication undertaken on a permanently inhabited island anywhere in the world,” says Andrew Walsh of the Lord Howe Island Rodent Eradication Project, who is overseeing the effort to spread 42 tons of poisoned cereal pellets across the island. Some 28,000 bait stations were filled across farmed and residential areas starting 22 May, and helicopters will scatter baits over more forested and mountainous parts of the island as soon as weather permits.

Walsh and his colleagues hope to undo some of the damage from the voracious rodents, which have wiped out five endemic birds, two plants, and 13 insects, including the 15-centimeter-long, black, waxy-looking Lord Howe Island stick insect, also called the phasmid or tree lobster (Dryococelus australis). Some lost species, including the phasmid, have subsequently been rediscovered on surrounding islets. Eliminating the estimated 360,000 rodents—including house mice, which arrived in the 1860s—could allow the native animals to return to the main island, and will also protect another 70 or more threatened species, such as the little shearwater, masked booby, and several endemic palms that grow in the island’s cloud forest.

I don’t know if this will work, for they have to get every single last rodent off the island (unless the last one is a male or non-pregnant female), and that would be hard. But they’re going ahead with the project, which will cost $ 7.3 million U.S. ($10.5 million Aus). Not everybody is in board with this, though, as some residents think the baits “might harm children, pets, cattle, and other wildlife or damage the lucrative tourist trade.” And the article adds:

People weren’t the only complication. Research in 2007 had revealed that the poison, a rodenticide called brodifacoum, might endanger two endemic birds, the Lord Howe Island woodhen and the Lord Howe Island currawong. Since April, a team from Sydney’s Taronga Zoo has been involved in rounding them up, housing the roughly 200 woodhens and 125 currawongs captured so far—more than half the wild populations—in aviaries and pens. The birds have “settled in beautifully,” says Leanne Elliott, wildlife conservation officer at the zoo. Once the poison has broken down, they’ll be released into the wild again, likely in stages toward the end of the year.

This is a massive conservation effort, and I hope it will work. The reintroduction of the stick insect is only speculative now, but will likely occur, since they plan a trial release of the Aussie-bred phasmids in 2021 on an islet in Lord Howe’s lagoon.

Here’s a prize-winning animation about the phasmids: “Sticky”.

THAT’S a bee!

February 22, 2019 • 7:30 am

JAC: In lieu of Reader’s Wildlife Photos today, I’ll take a break and importune you to keep sending me photos (I have a reasonable backlog, but I get nervous. . . .). In its place Greg has contributed a short piece about an enormous bee just rediscovered after several decades.

by Greg Mayer

There are many rare species, especially among invertebrates, that would not be encountered very often, even if they were not in decline. It is thus hard to know some species’ conservation status. Wallace’s Giant Bee (Megachile pluto) has not been seen since 1981, but the New York Times reported on Thursday that it has been rediscovered on one of the islands in its Northern Moluccas range. [Be sure to click on the photo, to get the full effect.]

Wallace’s Giant bee, with a honeybee for scale. Photo by Clay Bolt from The New York Times.

Note the insect in the upper left of the picture. “That’s not a bee.” The insect below it– “THAT’S a bee.”

The species had also not been seen between its discovery by Alfred Russel Wallace in 1859 and 1981, so it is perhaps not surprising that it was some time until a third encounter. Simon Robson, of the University of Sydney, reports that only a single individual was found, and photographed and filmed by Clay Bolt. They were part of a team that was part of an effort to search for other species that have not been seen for sometime. A previously unreported specimen of the Giant Bee was sold last year for $9100 on eBay, so there is concern that a market could develop that might make this apparently naturally rare species artificially rarer. That, combined with ongoing deforestation in Indonesia, creates concern for the species’ future.

JAC: I’ve added one photograph (with credits) that I found on another site:

Photograph of a specimen of Wallace’s Giant Bee © NJ Vereecken In Wildlife

Cheetah urine may help save the species

February 15, 2019 • 2:30 pm

The song at the beginning of this cheetah video shows what it would sound like if Barry White got involved in saving wildlife. Here’s a cool video from VICE about breeding cheetahs (Acinonyx jubata), and I hope they’re breeding them for release. I still get queasy about saving a species by keeping it permanently in captivity—especially a species in which individuals are evolved to lope and run.

What they do here is determine which male a female likes by exposing her to urine samples from diverse males. That will facilitate pairings that produce cubs.  Note that they collect the urine by putting a cologne—Calvin Klein’s “Obsession” (LOL)—on a urine-catching receptacle. Also note the female’s flehmen response, which you may have seen in your own cat.

The YouTube video:

The global cheetah population has plummeted over the last century. While zoo programs have made captive breeding a focus of their conservation efforts for endangered species, successful mating is a tricky dance. But inventive research has found that it may only take a few sterile gauzes soaked in urine to find that special someone to share the dance floor with.

h/t: Amy

The Crest-tailed mulgara is alive!!

February 10, 2019 • 12:45 pm

Yes, today we have a species long thought to be extinct, that, like Lazarus, has returned from the dead. It’s the Crest-tailed Mulgara (Dasycercus cristicauda), a small carnivorous marsupial that was thought for more than a century to be extinct, and whose existence was based on bone fragments. As Roaring Earth and the University of New South Wales report, recently one female was found in the desert of central Australia. And where there’s one, there’s more:

From the UNSW report:

A crest-tailed mulgara — thought to be extinct for more than 100 years — was recently found burrowing through the sand dunes of New South Wales.

Known previously only through fossilized remnants, the animal is one of two species of mulgara found throughout Central Australia. These marsupials have crested bushy tails, measure up to a foot in length, and boast sandy-blonde fur.

. . . A team from the UNSW Sydney’s Wild Deserts project made the unexpected discovery during recent scientific monitoring.

UNSW scientist and Wild Deserts ecologist Dr Rebecca West says it is particularly exciting to find a Crest-tailed Mulgara alive for the first time in NSW.

“The Crest-tailed Mulgara was once widely distributed across sandy desert environments in inland Australia, but declined due to the effects of rabbits, cats and foxes,” West says.

“The species weighs around 150 grams and has pale blonde fur and a thick tail with a distinctive black crest.”

The discovery comes at a great time, according to UNSW scientist and Wild Deserts project co-ordinator Reece Pedler.

“Next year we are due to begin introduced predator and rabbit eradication from a large area, which will no doubt help the Mulgara,” Pedler says.

From Roaring Earth, which makes a mistake in the first line (they mean “near extinction”):

The mulgaras were originally driven to extinction due to the introduction of invasive species including cats, foxes, and rabbits, all of which have European origins. Their return to existence in this specific area could be indicative of a natural decline in rabbit and invasive predator populations.

The recently spotted mulgara was found by researchers from the Wild Deserts project on a scientific monitoring trip in Sturt National Park, located just north-west of Tibooburra. Researchers identified the animal as a young female before releasing it back into the wild, hopeful for its reproduction.

Wild Deserts aims to reintroduce locally extinct mammal species back into their native habitats, which also involves removing some invasive species like rabbits, feral cats, and foxes. The greater bilby, burrowing betong, Western quoll, and Western barred bandicoot are the project’s primary focus, but they will now keep their eyes peeled for mulgara tracks as well.

Here are some photos of the rediscovered one:


Photo: Reece Pedler
Photo: Katherine Moseby

And a video:

Now what confuses me here is that there’s a Wikipedia page on the species, not mentioning its rediscovery, giving a range map, implying that there are a fair number of these things, and showing the picture below. They do say that there are two species in the genus, the other being the brush-tailed mulgara, but this one is clearly identified as the “crest-tailed mulgara”. Nor is the brush-tailed mulgara described as having nearly gone extinct.

Photo credit: Bobby Tamayo, Simpson Desert, QLD.

Perhaps Wikipedia has gone badly wrong here, in which case we have another examples for Greg Mayer’s long-promised “What’s the matter with Wikipedia?” post.

Readers are welcome to clarify this conundrum.

h/t: Kiera

A new paper confirms six subspecies of tigers, promoting conservation of the species (with some curmudgeonly comments on conservation genetics by Professor Ceiling Cat)

October 29, 2018 • 10:30 am

It’s a sad situation that the tiger (Panthera tigris), the world’s largest and arguably most magnificent wild cat, is heading towards extinction in nature. Fewer than 4,000 of them remain in the wild, and there are more in captivity than are roaming free in nature. Their current range is only 7% of the territory they occupied before humans killed them and destroyed their territory. Here, from Wikipedia, is a map of their present versus historical ranges. Sad, isn’t it?

One strategy for saving the tiger is to recognize subspecies, which are populations of the species that are recognizably different, either genetically (usually through inspection of DNA sequences) or through morphology (morphological differences, of course, often reflect genetic differences). Subspecies used to be called “races,” and still are by some people, but the term “race” is now in bad odor because of its past misapplication to our own species.

The designating-subspecies strategy here is two-pronged, with one prong scientific and the other political. The scientific rationale is that because populations differ genetically, saving different populations that are genetically diverse is a way to conserve overall genetic diversity in that species. Why? It’s sometimes not clear, but reasons given are to enable the species to recover if populations go extinct from inbreeding (a loss of genetic diversity), to conserve populations that look different and thus could be considered to have diverse appeal, and to save rare alleles that might prove adaptive under environmental change. I consider this strategy ill-conceived for reasons I’ll mention below.

The political reason is simply because some conservation laws, like the U.S.’s Endangered Species Act of 1973, allow a population to be listed as threatened or endangered if it’s not an entire species but simply a subspecies: a genetically different population. If you want to save a species, then, one way is to help save its constituent subspecies, regardless of the genetic rationale above. All that’s required is that a population be designated a subspecies because it is genetically different from other populations, and then that subspecies cannot be touched. Exactly how different a population must be to be regarded as a subspecies is not clear, and is subject to discussion and argument by biologists.

The use of the “subspecies” category thus gives conservationists a way to save species by saving their populations, even if the genetic rationale supporting it is weak. But because most conservationists and many biologists, including me, see saving species as an intrinsic good, regardless of genetic differentiation, we can use the “genetic differences” regulations as a way to do what we really want to do: save species as wholes regardless of how genetically different their populations are. And that surely holds for the vanishing tiger.

In other words, it’s in the interests of species-loving biologists to designate as many subspecies as possible as a way to save species, regardless of whether we agree with the “saving genetic diversity” argument. (As I said, I don’t really buy into that argument.) Thus you can use even tiny genetic differences, perhaps as little as a single gene causing change in, say, color—or even a diagnostic difference in DNA sequence of unknown function—as a way to designate subspecies and thus save species.

Now some biologists do think that we need to conserve genetic diversity within a species, and sometimes they might be right. But more often I think it’s a tactic to enable them to do what they feel impelled to do: stave off the destruction of threatened species by any means possible.

I hasten to add, though, that investigating population differences is of interest in its own right. For instance, we can get an idea whether those populations might be reproductively isolated (no gene exchange because of biological differences), and thus true species rather than subspecies. Or the genetic differences might give us some idea of the history of the species and the evolutionary relationships among populations. Or you might be able to identify illegal wildlife traffickers by looking at the DNA of material they’re selling.

An increase in tiger subspecies—or rather, a genetic confirmation of traditional subspecies— comes from a new genetic survey of the world’s tigers by by Yue-Chen Liu et al., just published in Current Biology (paper here, pdf here; reference below; ask if you can’t get it). There’s also a summary of the study in this week’s New York Times (click on screenshot below).

The upshot of the paper:

  • Tigers are genetically depauperate, probably because of a reduction in species size to around 50,000 during Pleistocene glaciation.
  • Nevertheless, sequencing of mitochondrial and nuclear DNA of tigers shows clear genetic differentiation among populations, and the well-demarcated populations (genetically, not morphologically) correspond to the six subspecies already recognized: the Bengal tiger, the Amur tiger, the South China tiger (only one specimen used), the Sumatran tiger, the Indochinese tiger, and the Malayan tiger.

Here’s a phylogeny of the tigers based on 11,600,055 autosomal variants, showing that they fall into six neat groups (consult the paper for caption and methodology) corresponding to the different subspecies already recognized (colors). Mitonchondrial and X-chromosomal analyses give similar phylogenies, and the numbers at the branches show that these are significantly demarcated using bootstrapping methods:


Below is a cluster analysis of tiger genomes using the “ADMIXTURE” program. The data are based on nearly two million variants on the autosomes. The different colors recognize units that the program can distinguish under assumptions of different numbers of clusters, with the number of clusters to look for set from 4 to 6. As you see, under the assumption of 5 clusters you get five subspecies, and with 6 clusters you get six subspecies. (This is not a trick, but a way to recognize hierarchically differentiated populations.)

  • Gene flow among populations was extant but low, reflecting the fact that they’re geographically isolated and have been so for some time. They aren’t considered different species because there is some gene flow and because hybrids, at least in captivity, are readily formed and are fertile.
  • These differences aren’t so readily discerned using morphology, since tiger subspecies generally lack diagnostic physical traits, though there are some average differences in size, shape and color (see here for a summary). That is, you can’t unambiguously put a single tiger into one of the six subspecies using morphology alone, but you can do it using just a few genes.
  • These findings, while confirming traditional classification, go against the suggestion of some biologists that there are only two subspecies of tigers. Those biologists say that having only two subspecies is better than having more, because the recognition of some very small subspecies, like the South China tiger, would make them “face extinction”. (This baffles me unless those researchers don’t think we should make an effort to save this population.)
  • Some of the DNA data give evidence that population differences arose by natural selection (this comes from the pattern of the variation associated with these regions). As the paper notes, “We identified multiple genomic regions that are candidates for identifying the adaptive divergence of subspecies. The body-size-related gene ADH7 appears to have been strongly selected in the Sumatran tiger, perhaps in association with adaptation to the tropical Sunda Islands.”

But genetics does confirm the populations previously recognized by average trait differences. That’s not a novel finding, but the genetically diagnostic differences, say the authors, will help us conserve the species. As they say in the paper (my emphasis):

Because many of the conservation policies and measurements regarding the tiger, including coordinated captive breeding programs and legislations in several tiger range countries, are based on “subspecies taxonomy,” an appropriate description of subspecies is vitally important.

Considering the subspecies concepts presented above, the genome-wide signatures of phylogeographic partitioning and evidence for long-term restriction of gene flow and adaptive divergence jointly allow us to elucidate tiger evolution and corroborate six phylogeographic units. These findings provide the strongest genetic evidence for subspecies delineation in tigers to date, evidence stronger than that used to define subspecies in nearly any felid reported thus far. These population units correspond precisely with the geographic subspecies named much earlier. . .

Understanding the tiger’s natural history from a genomic perspective provides a data-driven foundation for subspecies recognition, conservation strategic planning, and management actions. Our general goals are to reverse the species’ decline by maximizing the efforts to preserve the genetic diversity, evolutionary uniqueness, and potential of the species Panthera tigris.

The New York Times article echoes the conservation importance emphasized by the study’s authors.  But, as I implied above, recognizing six subspecies rather than two is important mainly because it gives biologists a legal handle to save tigers in general. The genetic differences between populations, as diagnostic as they are, are in my view not sufficient reason by themselves to save all populations. Sufficient reason to save the populations, though it won’t fly with governments and laws, is simply because we need to save as many tiger populations as we can, because they add to our world, because they were here before us, and because we have no right to wipe out a dwindling species for our own selfish needs. Despite their fierceness, tigers can’t fight human development. Most nature-loving biologists simply want any way to save tigers, and genetics (again, this is my opinion) gives them an excuse—but not a good population-genetic reason. Any one population of tigers surely contains enough genetic variation to replenish all the other populations, whether that variation be common or rare. And, of course, new mutations occur.

Here’s what one of the authors say in the NYT piece:

A system recently proposed by some scientists that would classify the world’s tigers into two subspecies would harm the world’s remaining tigers rather than benefit them, said Shu-Jin Luo, a geneticist at Peking University who led the study. Preserving what is left of tigers’ genetic diversity will require ensuring that all remaining subspecies are taken into account, she and her co-authors argue.

“If you think that all tigers are genetically homogeneous, you might say if you lose the Amur tiger, you still have the Bengal tiger — and that’s O.K. because they’re very similar,” Dr. Luo said. “But that’s not O.K., because now we know that tigers are not all alike.”

No, tigers are not all alike; they differ on average in appearance, and in DNA sequence, some of those differences probably being the result of geographically varying natural selection. But what do we gain by saving subspecies because they have genetic differences. What, indeed, are the genetic differences we’re trying to conserve? Genes for morphology? Those differences are inherent within in any one subspecies, so you could constitute any extinct population simply by either selecting variants within another subpopulation, or transplanting members of extant populations to areas of extinction, where selection will act eventually to create a new subspecies (it may be different from the old one). Are we trying to save variants that might be adaptive in the whole species, enabling it to respond to new selective pressures? If so, those variants are probably latent in several populations, so you don’t need to conserve them all. Are we trying to prevent inbreeding? Well, there’s no evidence that extinction is caused by inbreeding in this species, and to save them that way requires crossing members of different subspecies, which wipes out the differences we’re trying to conserve in the first place.

What I’m not saying here is that because the rationale for conserving genetic variation in tigers is weak, we shouldn’t try to save every subspecies. No, what I’m saying is that the genetic-variation excuse is a way that some biologists, chafing under legal restrictions, try to save every member of a species, no matter how many subspecies there are. Having six rather than two subspecies of tigers makes it easier to save them all, but what if the genetic variation analysis had shown just two, or four, distinct subspecies? Would it be less pressing to save tiger populations? I doubt that even conservationists would agree. And that shows that we’re using political rather than sound genetic rationales to save endangered species.

My message here is just this: we should save all the tigers because tigers are an inherent good. If we have to do that by recognizing subspecies, well, that’s the way we have to do it. But we shouldn’t pretend that we need to save subspecies to “conserve genetic variation in tigers”. That rationale is very weak, and makes conservation dependent on subjective criteria like the frequency of DNA variants that may not even play a role in adaptation—now or in the future. I think it’s time for conservation geneticists to tell us exactly what kind of genetic variation they want to save, and why. (There’s very little written about this.) And it’s time for biologists to admit that for many of us, our interest is not in conserving genetic variation, but in saving every tiger possible. The subspecies ploy is one way to do that, but it’s still a ploy.

We should save all tigers because of they are dwindling but magnificent; because of this:

(From the NYT): Tigers in a park in Hailin, northeast China. A century ago, about 100,000 tigers roamed Asia’s habitats. There remain only about 4,000 in the wild worldwide.CreditVisual China Group/Getty Images

The way to save tigers is not to designate subspecies and then use various schemes to conserve genetic variation, but to save the habitat in which tigers live and to keep people from poaching them.


Liu, Y.-C., X. Sun, C. Driscoll, D. G. Miquelle, X. Xu, P. Martelli, O. Uphyrkina, J. L. D. Smith, S. J. O’Brien, and S.-J. Luo. Genome-wide evolutionary analysis of natural history and adaptation in the world’s tigers. Current Biology, online. DOI:

What was the animal that inspired Dr. Seuss’s lorax? Biologists suggest a hypothesis

July 25, 2018 • 10:45 am

The New York Times from two days ago has an article about one of Dr. Seuss’s most famous books, The Lorax (you can see a preview of the book’s contents at the Amazon site). Here’s the article:

And the book at issue:

The book’s plot involves a man called the Once-ler visiting a beautiful forest of Truffula trees inhabited by the Lorax and many other species. Sensing a mercantile opportunity, the Once-ler cuts down the trees to manufacture “Thneed”, apparently a fabric used to make beautiful clothes. The Thneed factory expands, polluting the air and water, and eventually they cut down all the Truffula trees, putting themselves out of business. According to Wikipedia, the story ends like this (I haven’t read it):

Without raw materials, the factory shuts down and the Once-ler’s relatives leave. The Lorax says nothing but with one sad backward glance lifts himself into the air “by the seat of his pants” and disappears behind the smoggy clouds. Where he last stood is a small monument engraved with a single word: “UNLESS”. The Once-ler ponders the message for years, in solitude and self-imposed exile.

In the present, his buildings falling apart around him, the Once-ler at last realizes out loud what the Lorax meant: “Unless someone like you cares a whole awful lot, nothing is going to get better. It’s not.” He then gives the boy the last Truffula seed and urges him to grow a forest from it, saying that, if the trees can be protected from logging, then the Lorax and all of his friends may come back.

The Lorax was published in 1971, when the U.S. environmental movement was getting underway, with the National Environmental Policy Act passed in January, the first Earth Day celebrated in April, and the establishment of the Environmental Protection Agency in December. It was also the year that Joni Mitchell released her musical equivalent of The Lorax, the environmentalist song “Big Yellow Taxi.”

Dr. Seuss, too, was peeved as, according to the New York Times article, he was upset that a development project in San Diego proposed to cut down the eucalyptus trees around his home.

Seuss (real name: Theodore Geisel) wanted to write a children’s book about environmentalism, but got writer’s block, so his wife suggested they chill out at the Mount Kenya Safari Club, a fancy resort with plenty of animals and forest around. That lifted the block, and Seuss wrote most of The Lorax, a perennially popular book (over a million copies sold in 15 languages) in just one afternoon.

Now the book has been impugned for making The Lorax into a domineering and obnoxious sort of environmentalist (“ecopolice”), the argument being that he was the master of the forest and could decree its fate. But a new paper in Nature Ecology & Evolution (reference at bottom, free link here, free pdf here) suggests this interpretation is wrong: the Lorax was really based on two species that are part of Kenya’s ecosystem, and The Lorax simply an animal activist calling for the preservation of entire ecosystems, whose parts are interdependent. (This “reinterpetation” of the book seems to me largely a distinction without a difference, and thus not that exciting, as well as virtually untestable.)

What’s more interesting, as detailed in the paper, is that the Lorax and the Truffula trees might have been inspired by real animals and plants that Seuss saw in Kenya. The authors’ hypothesis is that the Truffula tree is the whistling thorn acacia (Acacia drepanolobium), a tree on which lives the patas monkey (Erythrocebus patas). The monkey gets over 80% of its diet from the gum and leaves of the tree, and the monkey’s depredations don’t hurt the tree. This is then an example of a commensalism: a relationship between two species in which one benefits and the other isn’t harmed. If you wipe out the tree, the monkey goes with it. (As I mention below, this is in fact happening.)

The Truffula trees do look, to the authors, like the spindly whistling thorn acacia. You can see a Truffula above, and here’s the acacia:

Here’s a photo of various parts of the story, including E. patas in the acacia, from the Nature paper:

(From the paper): a, Location of the Mount Kenya Safari Club together with data on the patchy distribution of patas monkeys (E. patas) in Kenya. A comparison of historical records (pre-1996) and surveys between 1996 and 2004 indicates that the range of E. patas has declined by 46% in Kenya24. b, The Lorax in the crown of a silk-tufted Truffula tree. c, Spindly tree that resembles the whistling thorn acacia (A. drepanolobium). d, Male patas monkey; the subspecies in Kenya (E. patas pyrrhonotus) is distinguished by its black facial skin and white nose25. e, Female patas monkey feeding on A. drepanolobium.


But what is the lorax? The authors further suggest that the lorax was modeled on E. patas, and test this by using fancy “eigenvalue decomposition methods” to compare the Lorax’s face to that of three primates (see photo below) as well as another Seuss character that looks similar: a “control” creature in The Foot Book. They find that the Lorax clusters with two cercopithecine monkeys: the patas monkey and the blue monkey (C. mitis). The comparison:

(From the paper’s Figure 3): We used a characterized camera19 to photograph every forward-facing image of two Seussian creatures, the Lorax (n = 13) and the bipedal creature in The Foot Book (n = 13). We calculated the mean face of each creature19 and projected it into a space containing the faces of every cercopithecine monkey in Kenya: the patas monkey; the tantalus monkey (Chlorocebus tantalus); the red-tailed monkey (Cercopithecus ascanius); the blue monkey (Cercopithecus mitis); and the De Brazza’s monkey (Cercopithecus neglectus). We used eigenface decomposition methods to calculate facial similarities19 and we generated the plot with t-distributed stochastic neighbor embedding (t-SNE)26, an iterative algorithm that down-projects multidimensional information into two dimensions for visualization.

The authors have other “evidence:”

Dates, physical similarities and probable encounters underlie our proposal that patas monkeys inspired the Lorax. His physical appearance postdates Geisel’s trip to Kenya, evolving into a short, “sort of man” with a signature moustache; his mossy pelage was blue before it was orange (Fig. 2). Many of these final traits are shared with patas monkeys and it is probable that Geisel encountered them at the Mount Kenya Safari Club (Fig. 1a). Even the voice of the Lorax (a “sawdusty sneeze”) resembles the ‘whoo-wherr’ vocalization of patas monkeys; the ‘whoo’ is a loud, wheezing expiration of air. It appears to be an alarm call issued in response to predators and human observers.

From this the author’s conclude that “Geisel drew inspiration from a ceropithecine monkey and its ecology” when writing The Lorax in Kenya. That’s possible, although the Lorax is most facially similar to the blue monkey, which is neither blue nor commensal with the acacia, but has a wider diet. If that’s the case, then the similarity between the Truffula tree and the whistling thorn acacia falls apart. The hypothesis is semi-interesting, but there’s no way to test it given the lack of verification from Seuss, and I’m not convinced by the author’s arguments that the lorax is really based on the patas monkey.

I’m even less convinced by the authors’ rewriting of the book’s interpretation, which is almost postmodern:

If this natural commensalism [between acacia and patas monkey] informs The Lorax, it challenges traditional interpretations of the Lorax as an ecopoliceman asserting his authority. If the Lorax is based on the patas monkey, he can be seen as a sustainable consumer dispossessed of his commensal partner and an equal victim of environmental degradation.

Well, yes, all this is as possible as anything else. And the authors do point out that this commensalism is endangered, as the acacia is being heavily browsed by giraffes, rhinos and elephants, and that, combined with its use as charcoal, is bringing the tree toward extinction. Likewise, the range of the patas monkey is said to have “collapsed” recently, so Seuss’s lesson, even if not drawn from this system, still applies: stop destroying ecosystems by removing an important element.

Granted, this short (three-page) paper is in the “books and arts” section of the journal, and it’s a semi-fun read, but to me doesn’t make a convincing case. And I’m not sure why Joanna Klein wrote a longish piece about the paper for The New York Times. The source of the lorax remains, at least to me, a mystery. Whether an eco-policeman or part of an endangered ecosystem, the Lorax has brought joy to children for fifty years.

h/t: Bruce Lyon


N. J. Dominey, S. Winters, D. Pease, and J. P. Higham. 2018. Dr. Seuss and the real Lorax. Nature Ecology & Evolution 2:1196-1198,

Bat rescue: Kali the flying fox

March 31, 2018 • 2:30 pm

Make sure you enlarge and turn the sound up on this video, which I purloined from Facebook. It’s the story of how an endangered fruit bat (“flying fox”) named Kali was rescued by keepers at the Oregon Zoo. As the video notes, Kali is a Rodrigues flying fox (Pteropus rodricensis), endemic to the 108 km² island of Rodrigues in the Indian Ocean.  It was critically endangered (and is still listed as such) because of habitat loss, hunting and bad weather, so in 1976 25 bats were collected for breeding. They’re now increasing in captivity and on the island, which has a population of 3,000—up from fewer than a hundred. It’s looking like a success story, but there’s a way to go.

It’s frugivorous, of course, and social, living in large colonies, like the one you see here in captivity.

For more information on this species, see the entry at ARKive.

This is a gorgeous animal, as all bats are. They’re so interesting and, except for the rabies issue, harmless to humans, so I don’t know why so many people shun them.

Should we bring wolves back to Scotland? A video and a questionnaire

March 29, 2018 • 10:30 am

by Matthew Cobb

It used to be standard practice for final year science students to do a lab-based research project. At the University of Manchester we have broadened the choice of final-year projects so that biology students can also choose to do a Science Media Project. This involves creating a portfolio of writing and other work around a scientific topic. Last year we featured films made by two of my students, and the comments from readers were invaluable.

I’d like to for you help again, by watching this 20-minute video by my student, Kirsty Wells, on the topic of ‘rewilding’. As she explains:

I have produced a short documentary exploring the possibility of wolves being reintroduced into the Scottish Highlands. Having extensively reviewed the literature surrounding the impacts of re-established wolf populations in other parts of the world (Western Europe and Yellowstone National Park), I decided to investigate how these impacts may apply in the context of Scotland. I ventured up North to meet with a few people to discuss what wolf reintroduction would mean to them, and what it could mean for the people of Scotland and Britain more broadly.

Please have a look at her video, and then fill out the quick questionnaire – no personal data are collected! Your comments below would also be greatly appreciated.