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For some as yet unknown reason, woolly bear caterpillars wander extensively in autumn before hibernating. Folk lore suggests that wide black bands on woolly bears foretell a cold winter, but there is no known factual basis for this belief. Younger larvae often have more black than mature (last instar) woolly bears, and it has been suggested that if winter comes early young larvae are forced to wander and hibernate. However, apparently only nearly mature woolly bears hibernate.