One of them, Mixodectes pungens lived in western North America during the early Paleocene–about about 66 to 56 million years ago. It was first discovered over 140 years ago by paleontologist ...

A small mixodectid mammal called Mixodectes pungens had skeletal features adapted to living in trees, largely dined on leaves, and weighed about 1.3 kg, according to an analysis a remarkably complete ...