Crazy caterpillar with erupting tentacles

April 29, 2015 • 3:20 pm

At Rainforest Expeditions, entomologist Aaron Pomerantz describes a weird caterpillar that he found on a guided tourist expedition to the Peruvian rainforest.  It has this weird behavior . . .

His ID:

After a little research, I found that this caterpillar is in the moth family Geometridae and is in the genusNematocampa. Also referred to as ‘horned-spanworms’ or ‘filament bearers’, these peculiar caterpillars can be found in North America and the Neotropics.

Okay, why do you think they do this? Pomerantz floats three hypotheses (indentations are his words):

1. David Wagner, in his field guide ‘Caterpillars of Eastern North America,’ notes:

“It is difficult to imagine what the [Nematocampa] larva is mimicking, but the overall effect is not unlike a fallen brown flower with exerted stamens. Alarmed caterpillars shunt hemolymph into filaments, enlarging them by as much as twice their resting length.”

What Wagner seems to be proposing is that the larva movement is similar to the way flowers or other plant matter move in the wind: the behavior more effectively blends the caterpillar into its surroundings.

I don’t find that terribly plausible, for the movement is coordinated and sudden, and would be detected by a predator (after all, it’s the predator who sets it off!).

2. The tentacles extend when the caterpillar is alarmed so that an attacking predator (such as a bird) has a higher probability of snagging a tentacle, as opposed to the main body, so that the caterpillar may drop away and escape with its life (similar to how some lizards are able to lose their tails).

More plausible, although this would be better if the tentacles were colored or had other ornaments that would distract a predator away from the body.

3. The setae, or “hairs,” located at the tip of a long tentacle could be highly sensitive vibration detectors that are able to sense predacious birds or insects that make nearby sounds.

Not that plausible, as if there’s a nearby predator that sets it off, what good does it do to detect the predator by touch?

There’s another hypothesis, too, which is mine: the tentacles secrete or spray some noxious substance that deters predators. The problem with that is that I can’t see anything coming out of the tentacles. But it could be invisible, like moth pheromones.

And yet another: the tentacles could make the caterpillar look bigger, deterring predators.

Finally, maybe the caterpillar is mimicking some other noxious animal that we don’t know about.

Your guesses?

 

Oliver Sacks: Still working but saying goodbye

April 29, 2015 • 12:15 pm

Oliver Sacks is going to die, and that makes us (and him, of course) the unlucky ones. In February I wrote with sadness about Sacks’ announcment that he had terminal cancer, an announcment that was poignant and as full of humanity as we’ve come to expect from the man. The guy was sui generis—plagued by his own mental and physical problems, which he wrote about with candor, but filled with empathy for the badly afflicted people he encountered as a neurologist. He was, too, a superb writer and storyteller: maybe not so much a scientist as a messenger of science. But whatever you call him, you can’t dislike him, and I think we’ll all miss him when, as he predicts, he’ll be gone in a few months.

The good news is that we have the man for a while longer, and he’s still working.  For instance, yesterday his autobiography came out: On the Move: A Life.  It’s already #22 on Amazon’s bestseller list, and the New York Times‘s captious critic Michiko Kakutani gave it a good review. Excerpts:

That love of the world and Dr. Sacks’s wisdom about human beings — and the mysterious connections between the brain, the mind and the imagination — have animated his writing over the years, from “Migraine,” published four and a half decades ago, through “Awakenings” and “The Man Who Mistook His Wife for a Hat,” and more recent works like “Uncle Tungsten,” “Hallucinations” and “On the Move,” his deeply moving new memoir.

. . . In “On the Move,” Dr. Sacks trains his descriptive and analytic powers on his own life, providing a revealing look at his childhood and coming of age, his discovery and embrace of his vocation, and his development as a writer. He gives us touching portraits, brimming with life and affection, of friends and family members (relatives that include, remarkably enough, the Li’l Abner cartoonist Al Capp and the Israeli diplomat Abba Eban). He recounts conversations about writing with the poet Thom Gunn — “the rushes and stoppages, the illuminations and darknesses.” And he describes W. H. Auden leaving America after 33 years to return home to England, looking “terribly old and frail, but nobly formal as a Gothic cathedral.”

And, in the latest issue of the New Yorker, Sacks has penned a fascinating description of his work with Spalding Gray, an actor famous for his searing and autobiographical monologues (you might remember “Swimming to Cambodia”.) In Sacks’ piece “The Catastrophe,” he recounts how Gray, after a car accident that injured his frontal lobe, became increasingly depressive and, despite treatment by Sacks, ultimately killed himself by jumping off the Staten Island Ferry. It’s a case study, but an empathic one, and perhaps the last example of this kind of writing we’ll get from Sacks. (I hope not.)

Finally, Sacks has written an autobiographical essay/literature survey in the New York Review of Books: “A general feeling of disorder.” It’s largely about his own battles with migraines, and he winds up discussing the dreadful medical treatment he accepted to buy himself a few more months of respite from the metastatic cancer that had filled his liver. It’s a grim but fascinating procedure in which beads are injected into the hepatic artery to block blood vessels, cutting of circulation to the liver tumors and thus killing them. The unfortunate byproduct is that all the dead cells and their exudates flooded his system, causing him a long period of “general disorder” as the debris was mopped up by his immune system. Fortunately, it seems to have worked, and he’s going to have it done again.  Here’s his ending:

Epilogue

The hepatic artery embolization destroyed 80 percent of the tumors in my liver. Now, three weeks later, I am having the remainder of the metastases embolized. With this, I hope I may feel really well for three or four months, in a way that, perhaps, with so many metastases growing inside me and draining my energy for a year or more, would scarcely have been possible before.

Charlie Hebdo was neither racist nor Islamophobic

April 29, 2015 • 10:00 am

When I first heard about the Charlie Hebdo massacre, and saw some of the cartoons that, claimed the apologists, were racist and Islamophobic and thus “provoked” the murders, I did some research. I read about the magazine, looked at the cartoons in context, and, most important, consulted French-speaking friends (I read it okay, but preferred greater expertise) about what exactly the slogans and cartoons meant and what (if they read Charlie Hebdo) the magazine was all about.

From that I concluded two things. First, Charlie Hebdo was not “Islamophobic” or racist, for it made fun of all religions on a pretty equal basis, and defended real racial groups (Muslims aren’t a race by anyone’s lights) against French xenophobia. The artists and writers were clearly a bunch of heathens, and saw right through the follies of faith and real ethnic hatred. Catholicism was a frequent target. Second, the cartoons that supposedly demonized Muslims were actually either making fun of faith or calling out the French Right for being anti-Muslim and anti-immigrant. They were in fact defending minority groups against real hatred and racism.

Finding that out didn’t take much work, and so I am appalled when some bloggers (and now writers and cartoonists like Garry Trudeau) still call out Charlie Hebdo for purveying “hate speech”. I’d like to point out two items that further dispel this notion, though Social Justice Warriors who have already decided to tar Charlie Hebdo with manufactured outrage will never change their minds.

First, I call your attention to the New Statesman article by Robert McLiam Wilson, “If you don’t speak French, how can you judge whether Charlie Hebdo is racist?” Wilson, though Irish, actually writes for Charlie Hebdo (he’s the sole Anglophone columnist), and he says this:

I read the papers and the blogs and the general runes. The growing consensus seems to be that Charlie Hebdo is, at the very least, deeply dodgy, if not overtly racist. Well, that’s a blow, I must say. Who knew I’d end up writing for some cartoon version of Mein Kampf?

Much of this anti-Charlie prissiness comes from how the magazine has been typified in the Anglo press. ie, idiotically for the most part. An infinity of pundits have made blithe diagnoses of general knavishness while not speaking any French at all.

This bears repeating. No. French. At. All. The point about language is absolutely crucial. Indeed, it may well be the only real point. It is so preposterous that it makes my head spin. How can you make any sensible judgement about Charlie if you cannot read it? Is it enough to look at the pictures? Didn’t we used to hesitate before doing something so confidently asinine? Can you imagine how enraged we would be if monolingual French people judged Private Eye or Spitting Image with the same blind assurance.

Do the writers boycotting Charlie in New York all speak French? If they don’t, then, seriously, how informed can their opinions be? You might as well ask your budgie for comment. So, Feathers, what’s your view?

Here’s an example of a Charlie Hebdo cartoon that, you may recall, was represented as racist right after the murders:

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This was explained to me by a Francophonic friend, but let me reproduce Wilson’s take:

A lot of this is centred around a cartoon that depicted Christiane Taubira, the French justice minister, as an ape. It is much-reproduced without its line of text Rassemblement Bleu Raciste (Racist Blue Rally). A crucial detail since it lampoons the Front National slogan Rassemblement Bleu Marine (Navy Blue Rally), a pun on the name of the FN leader Marine Le Pen. And the image itself was a mocking attack on a series of right-wing publications and websites bunged to the brim with disgraceful imagery of the minister. Without the snipped-off text underneath, and the knowledge of the lamentable tosh it was lampooning, of course Charlie would seem racist. It would seem racist to me too. But to strip the image of its fundamental components like this is akin to saying the incomparable Jonathan Swift was a baby-eating Nazi and that A Modest Proposal was actually a cookbook.

He then adds this (Wilson’s piece is funny):

Charlie is often vulgar, puerile and slightly nauseating. But everyone endures the brunt of this approach: right, left and in-between. They are not always funny (they are French, after all). But sometimes, that is because they are doing 4-page spreads on the reality of Roma camps in France or doggedly chronicling the gross extremes of France’s lurch to the right.

They have a weekly space for animal rights stories, for Chrissakes!!! Run by a woman who calls herself Luce Lapin. With the best will in the world, even if Lucy Rabbit wanted to be a racist or a fascist, how good at it would she be with a name like that? What would all the other racists and fascists think? The truth about the Charlie people is that they’re …well…just a little bit geeky.

Yes, Charlie is tasteless and discomfiting. Have I somehow missed all the gentle, polite satire? That amiable, convenient satire that everybody likes.

If you speak French and you tell me you think Charlie is racist, I can respect that. If you don’t speak French and you tell me the same, well (how to put this politely?)…sorry, I can’t actually put it politely.

Finally, the Jesus and Mo artist has sent out this tw**t breaking down Charlie Hebdo posts by topic.  You can read most of the figure without knowing much French, but the title, “De qui se moque-t-on,” can be translated as “Who are they making fun of?”

Screen shot 2015-04-29 at 4.28.22 AMh/t: Grania, Matthew Cobb

Readers’ wildlife photos

April 29, 2015 • 8:50 am

The tank is about 3/4 full of readers’ photos, so if yours hasn’t appeared don’t worry. And I’m always looking for good wildlife photos, so send yours in—though be aware that it could be up to two months before they appear if they are good. I try to let readers know when their photos are up.

Today we have photos from two regulars. By now you’ll know Stephen Barnard from Idaho, who has some nice avocets for us.

Here are some American Avocets (Recurvirostra americana) out my back door that are nearly tame. I think this is at least their second year with us. Neither Deets [his border collie] nor I can spook them without special effects.

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Origin of RECURVIROSTRA “New Latin, from Latin recurvus curved back (from re- + curvus curved) +
-i- + rostrum beak”

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Some fun avocet facts from the Cornell bird website:

With its elegant profile and striking coloration, the American Avocet is unique among North American birds. In summer it can be found in temporary and unpredictable wetlands across western North America where it swings its long upturned bill through the shallow water to catch small invertebrates.

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And a desert cottontail (Sylvilagus audubonii):

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Diana MacPherson sends some melanistic squirrels and, as always, anthopormorphizes them. Readers can tell us whether these are gray or fox squirrels (I suspect the former):

I saw this guy eating up all the seeds I left on the deck for the chipmunk. I didn’t have to crop to make bigger which is something I found very different from chipmunk photos – I usually crop to get more chipmunk in the photo and less of everything else. Here, I couldn’t even get the whole squirrel in!! The first photo is cute because he selects the seeds so delicately. You can really see his claws in both pictures and his tufty ear fur!

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Jesus ‘n’ Mo ‘n’ Some Animals are More Equal than Others

April 29, 2015 • 7:45 am

There’s one more comic today before we get to the readers’ wildlife photos. Here’s the latest Jesus and Mo, with the artist’s note in the accompanying email, “The Charlie Hebdo issue rumbles on.”

2015-04-29And allow me to point out the latest trope in the college I’m-Offended Movement: “Hate speech is not free speech.”

Viz.:

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Peregrine Cam!

April 29, 2015 • 6:20 am

Reader Malcolm reminds us that the peregrines nesting on top of Norwich Cathedral have just produced two chicks: little white fluffballs. Here’s a screenshot; click on it to go to the livecam. And if you go NOW, you’ll see the feeding! Mom is making a racket.

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There are other peregrine and kestrel cams in the UK: reader Pyers has given us a link to several of them. He adds this:

You will need to look at Cam 2 for a live feed of some local kestrels (Falco tinnunculus) that have nested on a ledge of a redundant (can’t they all be? ) church in the city ( Worcester – UK ). There are three eggs being incubated at the time.

Have a look at the other cameras … Apart from the fact that you get lovely views of my medieval city, you do occasionally get a peregrine coming in (the hope is that they will breed, but that hasn’t happened for couple of years) …