Paleontologists Perplexed by Swimming Predator With 'Screwdriver' Teeth
The ancient seas of the Late Cretaceous period would’ve been scary places to swim. Between 66 million and 100 million years ago, the world’s waterways were chock-full of real-life sea monsters. Not least of which were the sometimes bus-sized, possibly venomous, predatory lizards known as mosasaurs.