Ancient Toothy Mammal Survived Dino Apocalypse

A furry, beaverlike mammal that survived the apocalyptic dinosaur-killing space rock that crashed to Earth 66 million years ago hid out in what is now New Mexico, grinding up leafy meals with its enormous molars. It belongs to a group of rodentlike mammals called multituberculates, named for the numerous cusps, or tubercles, found on their teeth. Multituberculates lived alongside dinosaurs, but managed to survive the mass extinction at the end of the Cretaceous period.