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A common American moth (Pyrrharctia isabella), of an isabella color. The larva, called woolly bear and hedgehog caterpillar, is densely covered with hairs, which are black at each end of the body, and red in the middle part.

ehog caterpillar (Zoöl.), the hairy larvæ of several species of bombycid moths, as of the Isabella moth. It curls up like a hedgehog when disturbed. See Woolly bear, and Isabella moth. -- Hedgehog fish (Zoöl.), any spinose plectognath fish, esp. of the genus Diodon; the porcupine fish. -- Hedgehog grass (Bot.), a gra…

e salt-marsh caterpillar (see under Salt), the black and red woolly bear, or larva of the Isabella moth (see Illust., under Isabella Moth), and the yellow woolly bear, or larva of the American ermine moth (Spilosoma Virginica). -- Woolly butt (Bot.), an Australian tree (Eucalyptus longifolia), so named because of its…