Carnotaurus ("meat-eating bull"), was one of the most bizarre yet dangerous meat-eating dinosaurs ever found. Its skull was short, with spiked armor on the top and a pair of knobby horns over its small eyes. The neck and shoulder blades were well developed, but the arms were incredibly short, with forearms so shrunken they were practically just wrists; not even Tyrannosaurus rex had such small arms. With its small skull, Carnotaurus might not have been able to attack big plant-eaters, but it...