
Community identification
Woolly Bear Caterpillar
Pyrrharctia isabella
- Order & Family
- Lepidoptera, Erebidae
- Size
- Typically grows between 10 mm and 50 mm in length.
Natural Habitat
Found in temperate regions across North America, inhabiting fields, meadows, and gardens under logs or leaf litter.
Diet & Feeding
Polyphagous herbivores feeding on low-growing herbaceous plants including dandelion, clover, and various grasses.
Behavior Patterns
Rolls into a tight defensive ball when threatened. Overwinters as a caterpillar under debris, freezing solid before resuming activity in spring.
Risks & Benefits
Harmless to handle, though bristles may cause mild skin irritation in sensitive individuals. Serves as an important food source for birds and small mammals.