Impact Lab

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April 30th, 2009 at 7:12 am

Caterpillars Utilize Sound and Stench As Defense


A Very Crafty Caterpillar

Caterpillars of the Great Peacock Moth (Saturnia pyri) are generating quite a buzz lately. A recent study has shown that these giant silkmoth caterpillars are advertising acoustically that they are unpallatable and warn of an upcoming defense strategy.

When disturbed by a would be attacker the caterpillars stridulate by rubbing their mouth parts together, creating broadband chirps spanning from 3.7-55.1 kHz. While it is still unclear who exactly they are advertising to, a predator would be well advised to stay away from their sharp, chemical exuding bristles.


Though is not the first example of sound production in caterpillars it is a novel mechanism, paving the way for future research.

(more pics after jump)


Saturnia pyri chirp before or while they ooze foul-smelling droplets from their bristles. So the chirps might be a warning to attackers that there’s some serious resistance on the way, Yack and her colleagues propose online and in an upcoming Naturwissenschaften.

A close-up of a great peacock moth’s clumps of spikes shows the strong-smelling droplets they release when under attack. The little bumps that support the spikes start yellow and change colors as the caterpillar grows.


More HERE too!



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