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Northern Prairie Wildlife Research Center

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Caterpillars of Eastern Forests

Woolly Bear (Pyrrharctia isabella) [Isabella Tiger Moth]

JPG-Photo of Woolly Bear

Familiar, densely hairy black and red-orange caterpillar often seen crossing roads. Setae stiff and roughly of 1 length. Coloration as well as widths of orange and black bands vary considerably, with black portions giving way to orange as caterpillar matures. Food: grasses and forbs. Caterpillar: overwinters, September to May, and again in summer; 2 generations.

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