From the lazy, fiddling grasshopper to the sneaky Big Bad Wolf, children's stories and fables enchant us with their portrayals of animals who act like people. But the comparisons run both ways, as metaphors, stories, and images--as well as scientific theories--throughout history remind us that humans often act like animals, and that the line separating them is not as clear as we'd like to pretend. Here Martin Kemp explores a stunning range of images...