The miacids (Miacidae) were primitive carnivores which lived during the Paleocene and Eocene Epoch about 65 - 33 million years ago. Miacids are thought to have evolved into today's modern carnivorous mammals of the order Carnivora. The miacids were small marten-like carnivores with long, little bodies and long tails. Some species were arboreal while others lived on the ground. They probably fed on invertebrates, lizards, birds, and smaller mammals like shrews and opossums. Their teeth and skull… (More on Miacids)