Fossils of the large toothed diving bird " Hesperornis " are also found in the Niobrara chalk, sometimes preserves inside specimens of large predatory marine reptiles.
12.
Fossils of the large toothed diving bird " Hesperornis " are also found in the Niobrara chalk, sometimes preserved inside specimens of large predatory marine reptiles.
13.
In western Kansas, one of Marsh's four students, Thomas H . Russell, discovered a " nearly perfect skeleton " of " Hesperornis ."
14.
Other mesozoic birds like the toothed, but otherwise modern, birds like " Hesperornis " were included under the latter in their own superorder, the Odontognathae.
15.
Large fossilized aquatic birds called " Hesperornis " and " Ichthyornis ", found in western Kansas, indicate that the shallow sea was live with fish.
16.
Like many other Mesozoic birds such as " Ichthyornis ", " Hesperornis " had teeth as well as a beak, which were used to hold prey.
17.
This mistake was rectified by later authors, who sank " Hargeria " back into " Hesperornis " and renamed the more distinctive specimen " Parahesperornis ".
18.
"Parahesperornis " was a member of the Hesperornithes, flightless toothed seabirds of the Cretaceous and more specifically in the main lineage, close to " Hesperornis ".
19.
Following Darwin's publication, Thomas Henry Huxley used the fossils of " Archaeopteryx " and " Hesperornis " to argue that the birds are descendants of the dinosaurs.
20.
While " Hesperornis " is not thought to have left descendants, the earliest families, the Pelagornithidae and the Plotopteridae ( a group of large seabirds that looked like the penguins ).
