Banded wooly bear. Photo courtesy Whitney Cranshaw, Colorado State University, Bugwood.org Legend has it that the banded woolly bear can predict the weather. The size of their middle band is supposed to tell us whether the winter will be harsh or mild. There are other versions of this folklore, too, though none of it stands up to scrutiny. But the banded wooly bear is a cool caterpillar. It is one of the few species of moth or butterfly that overwinters…