Banded Woolly Bear
Scientific Name: Pyrrharctia isabella
Order & Family: Order Lepidoptera, Family Erebidae
Size: Caterpillars grow to approximately 1.5 to 2 inches (3.8 to 5 cm) in length.

Natural Habitat
Fields, meadows, gardens, and roadsides across North America, from southern Canada to Mexico.
Diet & Feeding
Generalist herbivores that feed on a wide variety of plants including grasses, clover, dandelions, plantain, and nettles.
Behavior Patterns
They are known for their ability to survive freezing temperatures during winter by producing a natural cryoprotectant. They often curl into a tight ball when threatened. Folklore suggests the width of their stripes can predict winter severity, though this is scientifically unfounded.
Risks & Benefits
They are generally harmless to humans, though their stiff bristles may cause mild skin irritation in sensitive individuals. They serve as a food source for birds and generalist predators, and the adult Isabella Tiger Moth is a minor pollinator.
Identified on: 3/12/2026