A mosasaur was any of a group of giant, carnivorous marine reptiles that lived during the
late Cretaceous period, about 85 to 65
million years ago. Mosasaurs, the largest of which was Hainosaurus with a length of up to 17 meters, were the top predators in the sea at the
time. Not being fast swimmers, they relied on stalking their prey which
included ammonites and turtles, as well
as larger animals such as sharks and plesiosaurs. The closest living relatives
of the mosasaurs are snakes.
|Reconstruction of a giant mosasaur