This ancient sea reptile had a slicing bite like no other

The mosasaur’s unusual cutting teeth may have been used to take on prey much larger than itself

mosasaur Xenodens calminechari scavenging a plesiosaur carcass

The razor-toothed mosasaur Xenodens calminechari (illustrated here) scavenges a carcass of the plesiosaur Zarafasaura oceanis in the late Cretaceous.

Andrey Atuchin

Shortly before a mass extinction ended the Age of Dinosaurs, a reptilian, barracuda-like carnivore with a mouth like a box cutter patrolled the warm seas that once covered swaths of what is now North Africa.