What is Archosaur?
{{Automatic taxobox | name = Archosaurs | taxon = Archosauria | fossil_range = <br />[[Early Triassic]]&ndash;[[Holocene|Present]], 250–0 mya | image = NileCrocodile.jpg | image_width = 250px | image_caption = [[Crocodile]]s basking in the sun. Crocodiles can move quite fast on land by tucking their legs under their body: an archosaur feature. | authority = [[Edward Drinker Cope|Cope]], 1869 | subdivision_ranks = Subgroups | subdivision = * [[Avemetatarsalia]] (Ornithodira)<br /><small>([[bird]]s and their extinct relatives)</small> * [[Pseudosuchia]] <br /><small>([[crocodilia]]ns and their extinct relatives)</small> * {{extinct}}''[[Albisaurus]]'' * {{extinct}}''[[Avipes]]'' * {{extinct}}''[[Palaeosaurus]]'' * {{extinct}}''[[Sikannisuchus]]'' * {{extinct}}''[[Smok (archosaur)|Smok]]'' | synonyms = Arctopoda <small>[[Ernst Haeckel|Haeckel]], 1895</small><br /> Avesuchia <small>Benton, 1999</small> }} '''Archosaurs''' are a large group of reptiles, including all [[crocodile]]s, [[bird]]s, [[dinosaur]]s, and [[pterosaur]]s (flying reptiles). There are also a number of smaller [[extinct]] groups, mostly from the [[Triassic]] period.<ref>Benton M. 1990. ''The reign of the reptiles''. Crescent, N.Y.</ref> The Archosaurs are definitely a [[monophyletic]] [[clade]], and do not include reptiles such as the [[Squamata]] (lizards and snakes) and the Sphenodontia (''[[Sphenodon]]'').<ref name=Archo>Brusatte, Stephen L. ''et al'' 2010. The higher-level phylogeny of Archosauria (Tetrapoda: Diapsida). ''Journal of Systematic Palaeontology''. '''8''': 1, 3{{ndash}}47. [http://www.tandfonline.com/doi/full/10.1080/14772010903537732#.UzrWCttrWHM]</ref> They have these [[diagnosis|diagnostic]] features,<ref>Nesbitt S.J. 2011. The early evolution of archosaurs: relationships and the origin of major clades. ''Bulletin of the American Museum of Natural History'' '''352''': 1–292. [http://digitallibrary.amnh.org/dspace/bitstream/2246/6112/1/B352.pdf ] {{Webarchive|url=https://web.archive.org/web/20190701161715/http://digitallibrary.