Assertion: plesiosaur | /r/CapableOf | grow to such enormous sizes
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text: My opinion has been that plesiosaurs grew to such enormous sizes (way exceeding those of even the biggest sea-turtles) and became so specialised for a life in water (enormous, mostly ventrally located pectoral and pelvic girdles, wing-like, claw-less paddles, pachyostotic bones etc.) that the presence of viviparity is more likely than the persistence of an egg-laying habit, especially when we know that diapsid reptiles of several lineages evolved viviparity on numerous separate occasions.