A game for birders to test their knowledge--with 200 cards offering 400 questions of varying difficulty about the birds of North America from the bestselling author and ornithologist David Allen Sibley. True or false: Many dinosaurs (the ancestors of modern birds) had feathers. If you answered "true," you just won a point playing this ultimate ornithology trivia game. Sibley Birder's Trivia offers 400 questions...