No, this is not a saber tooth cat, but Thylacosmilus, an ancient saber toothed marsupial
From the look of the fossilized skull, you’d think this was a Smilodon, a sabertooth tiger. But no, this is Thylacosmilus, not a cat at all, but an ancient form of today’s marsupials. Note the strange lower jaw that runs the length of the saber teeth....