Woolly worms are a type of caterpillar native to the United States ... will be colder and snowier than normal. If you find an all-brown woolly worm, that would indicate a drier, more mild winter ...

All hail the woolly worm, harbinger of winter. The annual migration of the wooly worm caterpillar has begun ... from the earth in the colder months -- brown and black hair cover the bodies.