Thylacosmilus--marsupial sabertooth. Late Miocene to Late Pliocene (~10 million to 3 million years ago). Looks much like the Smilodon (sabertooth tiger), but is significantly different. It is a metatherian (marsupials are the living metatherians) more closely related to kangaroos & koalas. The similarity between Thylacosmilus and Smilodon is an excellent example of convergent evolution - two distantly relating forms converging upon a simular morphology and life habitat.
A study on the genus' premolar intercuspid notches indicate that Chasmaporthetes was likely hypercarnivorous rather than durophagus as its modern cousins (excluding the aardwolf) are. Description from carnivoraforum.com. I searched for this on bing.com/images
35 Cenozoic Creatures As Awesome (Or Even More So) Than Dinosaurs