If we meet an extraterrestrial who keeps shouting "gavagai!", how are we to decode its meaning? Do bees and dolphins possess a linguistic competence? Did the chimpanzees Sara, Washoe, and Nim acquire a human-like language? In this book, Premack examines our human fascination with using language as a tool to our understanding of ourselves. He clearly and wittily untangles the complex skein of arguments, put forth since Darwin's time, over whether we...