Wooly Bear Caterpillar

Jan 4, 2021

Woolly bear caterpillar, Pyrrharctia isabella
Credit Juanita Demchak [CC BY-NC-ND 2.0] via Flickr

Pyrrharctia isabella, the isabella tiger moth, banded woolly bear or just woollybear or woolly worm, occurs in the United States and southern Canada. It was first formally named by James Edward Smith in 1797.

The thirteen-segment larvae are usually covered with brown hair in their mid-regions and black hair in their anterior and posterior areas. In direct sunlight, the brown hair looks bright reddish brown.