Elasmosaurus lived in the Late Cretaceous Period, around 80 million years ago.
The purpose of Elasmosaurus’s neck remains unknown, though it may have helped in hunting. It was not completely stiff, though was not flexible enough to curve into an S-shape (like a flamingo) as is often depicted in older, outdated artworks.
Elasmosaurus likely ate fish and marine invertebrates, though the exact method of its hunting is a mystery. Some scientists believe it might have fed near the bottom of the ocean, digging prey out of the sea floor. Or it may have fed in the open ocean pelagic zone, striking fish with its long neck.