Animal diversity goes far beyond dogs, cats and people. That's a lot more than The Zoo or even the Discovery Channel. Movies only show the big, impressive ones, like man-eating tigers and man-eating sharks. It's a shame, because the monsters in the movies don't come close to the real thing. Dogs hold the record for the most diverse land mammals in the world, says Elaine Ostrander, a geneticist who studies dogs at the National Institutes of...