“#Elasmosaurids weren’t the completely stiff-necked creatures they’re sometimes made out to be — even a tiny amount of flexibility between vertebrae adds up when you have 70+ neck bones. But why did plesiosaurs have such a long neck in the first place? This is a difficult question [...]”
▻http://plesiosauria.com/news/index.php/why-did-elasmosaurids-have-such-a-long-neck
With nice pictures:
