What is Teratorn?
{{Automatic taxobox | name = Teratornithidae | fossil_range = [[Oligocene]]{{ndash}}[[Pleistocene|Late Pleistocene]]<br/>fossil range 25m to 10k years ago | image = Giant Condor.jpg | image_caption = ''[[Teratornis merriami]]'' skeleton from the [[La Brea tar pits]] | taxon = Teratornithidae | authority = [[Loye H. Miller|L. H. Miller]] 1909 | subdivision_ranks = [[Genus|Genera]] | subdivision = †''[[Teratornis]]''<br /> †''[[Aiolornis]]''<br /> †''[[Argentavis]]''<br /> †''[[Cathartornis]]''<br /> †''[[Oscaravis]]''<br /> †''[[Taubatornis]]'' }} The '''teratorns''' <ref>from the [[Greek language|Greek]] Τερατορνις ''Teratornis'', '[[monster]] bird'</ref> were a group of very large [[Bird of prey|birds of prey]] that lived in the [[Americas]] from the [[Oligocene]] to [[Pleistocene]] [[epoch (geology)|epochs]]. They are all [[extinct]] now. They include some of the largest known flying birds. So far, at least five species in four genera have been identified: Teratornithidae are related to [[New World vulture]]s (''Cathartidae'', [[Synonym (taxonomy)|syn.]] ''Vulturidae'').<ref name=Chatterjee07>Chatterjee, Sankar ''et al'' 2007. The aerodynamics of ''Argentavis'', the world’s largest flying bird from the Miocene of Argentina. ''Ameginiana'' '''104''' (30): 12398–12403. [http://www.pnas.org/content/104/30/12398] {{Webarchive|url=https://web.archive.org/web/20150924144022/http://www.pnas.org/content/104/30/12398 |date=2015-09-24 }}</ref> *''Teratornis merriami''.<ref name=Miller>Miller, Loye H. 1909. ''Teratornis'', a new avian [[genus]] from [[Rancho La Brea]]. ''University of California Publications, Bulletin of the Department of Geology'' '''5''': 305–317.</ref> 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&nbsp;cm (29.5&nbsp;in) tall with estimated wingspan of perhaps 3.5 to 3.8 metres (11.5 to 12.5&nbsp;ft), and weighed about 15&nbsp;kg (33&nbsp;lb); making it about a third bigger than living condors. It became extinct at