Birds of a feather usually flock together—but not in the case of a rare "white" mutant penguin, spotted Monday in a chinstrap penguin colony in Antarctica. (Watch video of the pale penguin.) The "blonde" penguin, seen at the edge of one of the South Shetland Islands (map), "astonished" tourists on a National Geographic Journey to Antarctica cruise, naturalist David Stephens, of the Lindblad Expedi