‘Merciless’ sea monster prowled the sea 66 million years ago

giant mosasaur with teeth like a killer whale ruled the oceans around Morocco towards the end of the Cretaceous period, a new study finds. The extinct predator, named , grew to about nine to ten metres long and near Casablanca in western Morocco, an area that was underwater during the Cretaceous period. The researchers found that the teeth of were often chipped, broken or worn down, suggesting the species damaged them while violently attacking and biting the bones of prey.