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Animal Photo: Woolly Bear Caterpillar

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Woolly Bear Caterpillar

The Isabella Tiger Moth (Pyrrharctia isabella) can be found in many cold regions, including the Arctic. The banded Woolly Bear larva emerges from the egg in the fall and overwinters in its caterpillar form, when it literally freezes solid. It survives being frozen by producing a cryoprotectant in its tissues. In the spring it thaws out and emerges to pupate. Once it emerges from its pupa as a moth it has only days to find a mate.

In most temperate climates, caterpillars become moths within months of hatching, but in the Arctic the summer period for vegetative growth – and hence feeding – is so short that the Woolly Bear must feed for several summers, freezing again each winter before finally pupating. Some are known to live through as many as 14 winters.

The larva is black at both ends, with or without a band of coppery red in the middle. The adult moth is dull yellow to orange with a robust, furry thorax and small head. Its wings have sparse black spotting and the proximal segments on its first pair of legs are bright reddish-orange.

The setae of the Woolly Bear caterpillar do not inject venom and are not urticant – they do not typically cause irritation, injury, inflammation, or swelling. Handling them is discouraged, however, as the bristles may cause dermatitis in people with sensitive skin. Their main defense mechanism is rolling up into a ball if picked up or disturbed.

(Source: Wikipedia.org)

 

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