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Ichthyornithes is an extinct group of toothed avialan dinosaurs very closely related to the common ancestor of all modern birds.They are known from fossil remains found throughout the late Cretaceous period of North America, though only two genera, Ichthyornis and Janavis, are represented by complete enough fossils to have been named.
The Pelagornithidae, commonly called pelagornithids, pseudodontorns, bony-toothed birds, false-toothed birds or pseudotooth birds, are a prehistoric family of large seabirds. Their fossil remains have been found all over the world in rocks dating between the Early Paleocene and the Pliocene - Pleistocene boundary.
In humans, the vermiform appendix is sometimes called a vestigial structure as it has lost much of its ancestral digestive function.. Vestigiality is the retention, during the process of evolution, of genetically determined structures or attributes that have lost some or all of the ancestral function in a given species. [1]
Late Quaternary prehistoric birds are avian taxa that became extinct during the Late Quaternary – the Late Pleistocene or Early Holocene – and before recorded history, specifically before they could be studied alive by ornithological science. They had died out before the period of global scientific exploration that started in the late 15th ...
View of birds flying around the Bird Key, a private island on Biscayne Bay that is now for sale as environmentalists are upset, because developers could build on the island, displacing all the ...
Elephant birds (3 P) G. Gastornithiformes (2 P) P. Extinct penguins (3 C, 57 P) Phorusrhacidae (3 C, 13 P) R. Raphinae (1 C, 3 P) Pages in category "Extinct ...
Birds evolved from certain feathered theropod dinosaurs, and there is no real dividing line between birds and non-avian dinosaurs except that some of the former survived the Cretaceous–Paleogene extinction event while the latter did not. For the purposes of this article, a 'bird' is considered to be any member of the clade Avialae. [1]
Ancient ‘terror birds’ were giant apex predators. Suspected new species is among the largest ever known
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