From the mammoth Argentinosaurus, which was as heavy as twenty elephants, to the tiny meat-eating Microraptor, which was smaller than a chicken, here are the dinosaur record breakers. Read about daggerlike fangs, switchblade claws, gigantic skulls, and flesh-ripping horns. Discover how the best-armed dinosaurs deterred their enemies with fearsome suits of armor or how the tallest of the tall stood as high as five-story buildings.--From publisher's description.