Editing Marine reptile (section)

== Extant groups ==
[[Image:Eretmochelys-imbricata-Kélonia-2.JPG|thumb|[[Hawksbill sea turtle]] (''Eretmochelys imbricata'')]]

* '''[[Sea turtle]]s:''' there are seven extant species of sea turtles, which live mostly along the tropical and subtropical coastlines, though some do migrate long distances and have been known to travel as far north as Scandinavia. Sea turtles are largely solitary animals, though some do form large, though often loosely connected groups during nesting season. Although only seven turtle species are truly marine, many more dwell in brackish waters.<ref name=":0" /><ref name=":1">{{Cite web|url = http://www.britannica.com/animal/sea-turtle|title = Sea Turtle|access-date = December 8, 2015|website = Encyclopædia Britannica Online|last = Zug|first = George R.}}</ref>
* '''[[Sea snakes]]''': the most abundant of the marine reptiles, there are over 60 different species of sea snakes. They inhabit the tropical and subtropical waters of the [[Indian Ocean|Indian]] and [[Pacific Ocean|Pacific oceans]], though very limited reports of sightings suggest they may be extending into the [[Atlantic Ocean]]. Sea snakes are venomous and their bites have been known to be fatal, though generally they only bite when provoked and often inject only a very small, non-fatal quantity of venom. Sea snakes are distinguished from terrestrial snakes by a vertically flattened tail.<ref name=":0" /><ref>{{Cite web|url = http://www.britannica.com/animal/sea-snake|title = Sea Snake|access-date = December 8, 2015|website = Encyclopædia Britannica Online}}</ref>
* '''[[Marine iguana]]''': marine iguanas live only on the [[Galápagos Islands]] and are not fully adapted to marine life. Although they feed exclusively on [[marine plants]] and spend a good deal of their time in the water, they do nest on land and need to bask in the sun to reach their ideal body temperature; they are thus also subject to terrestrial predators.<ref name=":0" /><ref>{{Cite web|url = http://animals.nationalgeographic.com/animals/reptiles/marine-iguana/?source=A-to-Z|archive-url = https://web.archive.org/web/20110521013313/http://animals.nationalgeographic.com/animals/reptiles/marine-iguana/?source=A-to-Z|url-status = dead|archive-date = May 21, 2011|title = Marine Iguanas|access-date = December 8, 2015|website = National Geographic}}</ref>
* '''[[Saltwater crocodile|Saltwater]] and [[American crocodile]]s''': none of the extant species of crocodiles are truly marine; however, the saltwater crocodile (''Crocodylus porosus'') does display adaptations to saltwater inhabitation and dwells in the brackish waters of Southeast Asia and Australia. Saltwater crocodiles dispose of excess salt in their bodies through specialized [[salt gland]]s. These are the largest species of crocodile, also making them the largest [[reptiles]]. They can grow up to six meters in length.<ref name=":0" /><ref name=":2">{{Cite web|url = http://animals.nationalgeographic.com/animals/reptiles/saltwater-crocodile/|archive-url = https://web.archive.org/web/20100204214413/http://animals.nationalgeographic.com/animals/reptiles/saltwater-crocodile|url-status = dead|archive-date = February 4, 2010|title = Saltwater crocodile|access-date = December 8, 2015|website = National Geographic}}</ref> American crocodiles (''Crocodylus acutus'') similarly prefer brackish over freshwater habitats.<ref name="Ellis1981">{{cite journal|last1= Ellis|first1=T. M.|title= Tolerance of Sea Water by the American Crocodile, ''Crocodylus acutus''|journal= Journal of Herpetology|volume= 15|issue= 2|year= 1981|pages= 187–192|doi= 10.2307/1563379|jstor=1563379}}</ref>