Editing Plesiosaurus (section)

==Palaeobiology==
[[File:Plesiosaurus 3DB.jpg|thumb|Restoration]]
''Plesiosaurus'' fed mainly on clams and snails, and is thought to have eaten [[belemnite]]s, fish and other prey as well.<ref>{{Cite news|url=http://news.bbc.co.uk/1/hi/sci/tech/4341204.stm|title = Plesiosaur bottom-feeding shown|date = 17 October 2005}}</ref> Its U-shaped jaw and sharp teeth would have been like a fish trap. It propelled itself by the paddles, the tail being too short to be of much use. Its neck could have been used as a rudder when navigating during a chase. ''Plesiosaurus'' gave live birth to live young in the water like most [[sea snake]]s. The young might have lived in [[estuary|estuaries]] before moving out into the open ocean.
It has been postulated that the long neck of ''Plesiosaurus'' would have been a hindrance when trying to speed up, any bend in the neck creating turbulences.<ref>{{Cite web|url=https://www.sciencedaily.com/releases/2017/07/170705132908.htm|title = Sticking your neck out: How did plesiosaurs swim with such long necks?}}</ref> If that is the case then ''Plesiosaurus'' would have had to keep its neck straight to achieve good acceleration, something that would make hunting difficult. For this reason it may be possible that these animals would actually lie in wait for prey to come close instead of trying to pursue them.