One of the mammals that survived the dinosaur apocalypse, hid out in New Mexico?

Kimbetopsalis simmonsae is the mammal in question, that hid out in Northwest New Mexico. Although the creature survived the dinosaur extinction, the creature superseded the rise of rodentia and the like, which lead to the decline of this particular species. According to a scientific article, written by Laura Geggel, which can be read over at Live Science.

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.