When disturbed, they commonly roll up in a ball.They are usually black on the ends of the body and rusty red or brownish in the middle. Woolly bears are fuzzy with dense, stiff hairs.They, like many other moth caterpillars, can be parasitized by wasps that lay their eggs on them and eventually kill them. The caterpillars are herbivores that graze on vegetation.From Woolly Bear Caterpillar to Isabella Tiger Moth The fall migration of woolly bear caterpillars still remains a reliable sign of impending weather. The brown to black ratio is more an indicator of their age and how long they've been feeding than mild or harsh winter predictions. However, they function less for warmth on woolly bear caterpillars and more for helping them to freeze over more controllably. The thickness of their bristles were seen in folklore as a snow predictor. Woolly bears cross roads in droves as they look for winter dens. Hollow logs, piles of leaves, cracks in foundations and stacks of firewood are all good places to hide. Since caterpillars can't migrate south, their only option is to find a protected place to spend the winter. Woolly bears are leaf-eaters, and they are quick to notice the shortage of food. Woolly bears were the weather predictors of folklore.Īs the days grow shorter and the nights grow cooler, most green plants stop growing. But even before there were paved roads, people noticed the woolly bear migration. On sunny autumn days, woolly bear caterpillars cross roads and highways. While all bears are preparing for the winter, it's the familiar fuzzy caterpillar known as the woolly bear that clearly signals that cold weather is just around the corner.

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