Post-dinosaur mammals were fat and slow

A near complete fossil of an ancient mammal proves it wasn't much of a runner.  Many of the mammals that emerged right after the non-avian dinosaur extinction were hearty creatures, as exemplified by Ernanodon.  The skeleton that is the focus of the study is nearly complete, revealing how this early mammal looked in the flesh and lived.  Ernanodon was a badger-sized, rather chunky mammal with a short square skull, extremely reduced dentition and big claws on the forelimbs.