Description Sometimes stories are told so often that people begin believing them even though they are not true. If enough people believe these untrue stories, they are called myths. Do you know what's true or not? Do porcupines really throw their quills? Can someone be as blind as a bat? Are snakes slimy or do opossums hang by their tails? And just how much wood can a woodchuck chuck? Learn what's true and what's not in the latest addition to Mary Holland's Animal Anatomy and Adaptation series.