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Teratornis
''Teratornis'' was a huge North American teratorn bird of prey. It is the best-known of the teratorns. A large number of fossil and subfossil bones, representing more than 100 individuals, have been found in locations in California, Oregon, southern Nevada, Arizona, and Florida, though most are from the Californian La Brea Tar Pits. All remains except one Early Pleistocene partial skeleton from the Leisey Shell Pit near Charlotte Harbor, Florida (which may represent a different species or a subspecies) date from the Late Pleistocene, with the youngest remains dating from the Pleistocene-Holocene boundary.
==Taxonomy==
* ''Teratornis merriami''.〔 This is by far the best-known species. Over a hundred specimens have been found, mostly from La Brea Tar Pits. It stood about 75 cm (29.5 in) tall with estimated wingspan of perhaps 3.5 to 3.8 metres (11.5 to 12.5 ft), and weighed about 15 kg (33 lb); making it about a third bigger than extant condors. It became extinct at the end of the Pleistocene, some 10,000 years ago.
* ''Teratornis woodburnensis''.〔Campbell, Kenneth E. Jr. & Stenger, Allison T. (2002): (A New Teratorn (Aves: Teratornithidae) from the Upper Pleistocene of Oregon, USA ). pp. 1–11. in Zhou, Z. and F. Zhang. ''Proceedings of the 5th Symposium of the Society of Avian Paleontology and Evolution Beijing'', 1–4 June 2000. China Science Press, Beijing.〕 The first species to be found north of the La Brea Tar Pits, this partial specimen was discovered at Legion Park, Woodburn, Oregon. It is known from a humerus, parts of the cranium, beak, sternum, and vertebrae which indicate an estimated wingspan of over 4 meters (14 ft). The find dates to the late Pleistocene, between 11,000 and 12,000 years ago, in a strata which is filled with the bones of Mastodon, Sloth and Condors, and bears evidence of human habitation.
Another form, ''"Teratornis" olsoni'', was described from the Pleistocene of Cuba, but its affinities are not completely resolved; it might not be a teratorn, but has also been placed in its own genus, ''Oscaravis''. There are also undescribed fossils from southwestern Ecuador, but apart from these forms, teratorns were restricted to North America.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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