Hesperornis (meaning "western bird") is a genus of cormorant-like Ornithuran that spanned throughout the Campanian age, and possibly even up to the early Maastrichtian age, of the Late Cretaceous period.[1][2] One of the lesser-known discoveries of the paleontologist O. C. Marsh in the late 19th century Bone Wars, it was an early find in the history of avian paleontology. Locations for Hesperornis fossils include the Late Cretaceous marine limestones from Kansas and the marine shales from Canada. Nine species are recognised, eight of which have been recovered from rocks in North America and one from Russia.
^Alyssa Bell; Kelly J. Irwin; Leo Carson Davis (2015). "Hesperornithiform birds from the Late Cretaceous (Campanian) of Arkansas, USA". Transactions of the Kansas Academy of Science. 118 (3–4): 219–229. doi:10.1660/062.118.0305. JSTOR 24887762. S2CID 83921936.
^Cite error: The named reference Hills99 was invoked but never defined (see the help page).
million years ago). It is the only species of Hesperornis for which a nearly complete skull is known. Hesperornis crassipes was named in 1876 by Marsh, who...
freshwater habitats in the Northern Hemisphere, and include genera such as Hesperornis, Parahesperornis, Baptornis, Enaliornis, and Potamornis, all strong-swimming...
is a natural group which includes the common ancestor of Ichthyornis, Hesperornis, and all modern birds as well as all other descendants of that common...
noted the rare and unique quality of these toothed birds (including Hesperornis, which was found to also have teeth by 1877), and the irony of their...
In addition to non-crown group primitive birds like Archaeopteryx, Hesperornis and Confuciusornis, therefore, pan-group birds would include all dinosaurs...
Max (1 January 1935). "Colymbus, Hesperornis, Podiceps: ein Vergleich ihrer hinteren Extremität" [Colymbus, Hesperornis, Podiceps: a comparison of their...
any other member of the Hesperornithes, with the possible exception of Hesperornis regalis, but still much is left to conjecture. The loon-sized bird was...
the late Cretaceous. Strong-swimming and toothed predatory waterbird Hesperornis roamed late Cretacean oceans. The ammonite Discoscaphites iris, Owl Creek...
radiolarians. The seaway was home to early birds, including the flightless Hesperornis that had stout legs for swimming through water and tiny wings used for...
and far between, at least compared with its contemporary relatives in Hesperornis. Remains are known from central North America, namely the former shallows...
Goniopholis Mark Acheson as Marvin Mosasaurus Michael Adamthwaite as Jess Hesperornis, Reggie Raptorex Ashleigh Ball as Arnie Argentinosaurus, Crystal Cryolophosaurus...
Cretaceous period, the earliest being the Hesperornithiformes, like Hesperornis regalis, a flightless loon-like seabird that could dive in a fashion...
related to dinosaurs. Though some dinosaurs were or are semiaquatic, (Hesperornis, Spinosaurus, auks, penguins), none are known to have been fully marine...
publication, Thomas Henry Huxley used the fossils of Archaeopteryx and Hesperornis to argue that the birds are descendants of the dinosaurs. Thus, a group...
(Aves)". Steenstrupia. 16: 21–36. Stolpe, M. (January 1935). "Colymbus, Hesperornis, Podiceps:, ein Vergleich ihrer hinteren Extremität". J. Ornithol. (in...
Phosphorosaurus hunts lanternfish under the ocean's moonlit surface. Hesperornis hunt for fish until they themselves are hunted by Xiphactinus. Nostoceras...
have been found in the Smoky Hill Chalk formation of western Kansas (Hesperornis zone, dated to 83.5 million years ago), time-equivalent beds of the Mooreville...
"Odontornithes" are Hesperornis regalis, standing about 3 ft. high, the somewhat taller H. crassipes, and Ichthyornis dispar. Hesperornis looked somewhat...
dinosaurs and other fossil animals, including Triceratops, Brontosaurus, and Hesperornis. At the request of Marsh and to house some of his discoveries, Peabody...
Platecarpus, Plioplatecarpus, and Tylosaurus, as well as birds (Brodavis, Hesperornis, and Ichthyornis), plesiosaurs (Dolichorhynchops, Elasmosaurus, Styxosaurus...
recovered from the formation. Hesperornis altus? - "Tibiotarsus and vertebra." (possibly from the Judith River Formation) Hesperornis montana cf. Maiasaura Tyrannosauridae...
middle Campanian, nonmarine occurrence of the Cretaceous toothed bird Hesperornis Marsh." Canadian Journal of Earth Sciences, 11: 1335-1338. Scherer, Charlie...
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