“lengthy andrepeated bouts of abdominal tremulations” averaging 43 wiggles per second,
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, the researchers report January 17 in Frontiers in Zoology. You can see a male's moves in this video:
Credit: Samantha Vibert
These minor tremors were less likely to trigger females’ predatory response than were the struggles of prey caught in the web. Male hobo spiders,
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, on the other hand,
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, don’t face a threat from females and didn’t vary their movements much from those of prey.
Black widow spiders are just one species in a long line of animals that put their rears in gear. Here are a few fantastic uses of rear ends across the animal kingdom,
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, for reasons both sexual and nonsexual, complete with video links:
Peacock spiders: Flashdance
In one of the most beautiful displays of rump-shaking in the animal kingdom,
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, peacock spiders raise and shake a colorful flap on their abdomens as part of an elaborate mating dance. If you haven’t seen it,
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, you must,
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, and if you’ve witnessed it before you’ll want to see it again.
Peacocks: Infrasonic shake
Technically,
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, a peacock’s big fancy train is not its tail but on its back. The actual tail feathers are behind the display. After spreading its train, a male shakes the long feathers in either a “shiver” (from center feathers to outside feathers) or “pulse” (emanating from the base of all the train feathers). Scientists have found that the shaking creates infrasound below 20 hertz that are too low-pitched for humans to hear (we just hear rustling) but that peahens respond to

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