Animals of the Past

abundance African elephant ancestor ancient Archæopteryx beast birds body bones Brontornis Brontosaurus carnivorous Ceratosaurus changes comparatively covered creature Cretaceous deposits Dinosaurs Diplodocus drawing by J. M. early earth eggs elephant ence Eocene Epyornis existence extermination extinct animals feet long fishes flightless foot footprints fossils habits head Hesperornis horse family huge Hyracotherium inches long J. M. Gleeson Kimmswick known lake largest legs Lenape Stone length less little Hyracothere living Lizard mammals mammoth mastodon MESOHIPPUS Miocene Modern Horse Mosasaurs Museum of Natural National Museum North America ostrich past perished Phororhacos plates Plesiosaurs preserved prey probably Professor race reader remains reptiles rock sand saurs scientific sharks shell shore skull species specimen spines Stegosaurus stone strata structure tail teeth Thespesius thigh-bone tion to-day toes tooth tracks Triceratops tusks Tylosaurus United States National vertebrates wings Yale University Museum Zeuglodon