What is Crocodile?
{{for|the biological order|Crocodilia}} {{Automatic taxobox | name = Crocodylia | fossil_range = [[Upper Cretaceous]] – [[Holocene]], 94{{ndash}}0 mya | image = Nile crocodile head.jpg | image_caption = [[Nile crocodile]] (''Crocodylus niloticus'') | image2 = Pangil Crocodile Park Davao City.jpg | image2_caption = [[Saltwater crocodile]] (''Crocodylus porosus'') | taxon = Crocodylia | authority = [[Georges Cuvier|Cuvier]], 1807 | type_species = ''[[Crocodylus niloticus]]'' | type_species_authority = [[Joseph Nicolai Laurenti|Laurenti]], 1768 | range_map = | range_map_caption = | subdivision_ranks = Genera | subdivision = * ''[[Crocodylus]]'' * ''[[Osteolaemus]]'' * ''[[Mecistops]]'' ''(proposed)'' *† ''[[Voay]]'' }} A '''crocodile''' is a large amphibious [[reptile]]. It lives mostly in large tropical rivers, where it is an [[ambush predator]]. The Crocodylia is an [[order (biology)|order]] of mostly large, predatory, semiaquatic reptiles. Their ancestors, the clade [[Pseudosuchia]], appeared about 250 million years ago in the early [[Triassic]] period. Crocodiles as we know them first appeared 94 million years ago in the [[Upper Cretaceous]] period. They are the closest living relatives of birds: the two groups are the only survivors of the Archosauria. One species, the [[Australian]] [[saltie]], travels in coastal salt water as well as rivers. In very dry climates, crocodiles may [[aestivation|aestivate]] and sleep out the dry season. They are basically [[Archosaurs]], a group which also includes the [[dinosaurs]]. There are various species of crocodiles including the American, slender-snouted and [[Orinoco crocodile]]. The crocodile can quickly snap its jaw shut with much power. However, crocodiles have little strength when opening their jaws, such that a person can hold the jaw shut with their hands. Present-day crocodiles range in size from [[Africa|African]] [[Dwarf crocodile|dwarf crocodiles]] that measure rarely over 5 feet (1.5 m) to [[Saltwater crocodile|saltwater crocodiles]] which can appro