The moths have tan or orange heads, fuzzy wings, and several small black markings on their wings. The second generation of woolly bears is most commonly seen during the fall when they look for places to lay their eggs. Every two years, a new generation of woolly bears is born. During hibernation, woolly bears almost freeze solid. These bristles, which are black at the ends and reddish brown at the center, have a fuzzy appearance. ![]() Woolly bears are caterpillars of the Isabella Tiger moth. After the final instar, the caterpillar spins a cocoon and undergoes metamorphosis into an adult Isabella Tiger Moth. The fourth and final instar is when the caterpillar is mostly rusty brown with a black band near the head and tail. The first three instars are when the caterpillar is black with rusty brown bands. The wooly bear caterpillar goes through four stages of growth, or instars. ![]() They can grow to be about 2.5 inches long. The caterpillars are black with rusty brown bands. The adult moths are yellow-orange with black stripes and spots and have a wingspan of about 1.5 inches. ![]() The caterpillars are also sometimes called “banded woolly worms.” Wooly bears are the caterpillars of the Isabella Tiger Moth. The more black there is, the harsher the winter will be. The most popular belief is that the amount of black on a wooly bear caterpillar predicts the severity of the upcoming winter. They are also one of the few caterpillars that have their own folklore associated with them. The wooly bear caterpillar is one of the most recognizable and iconic caterpillars in North America.
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