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Antarctic fur seal  (Arctocephalus gazella)

Thylacoleo (“pouch lion”) is an extinct genus of carnivorous marsupials that lived in Australia from the late Pliocene to the late Pleistocene (2 million to 46 thousand years ago). Some of these “marsupial lions” were the largest mammalian predators in Australia of that time, with Thylacoleo carnifex approaching the weight of a small lion. The estimated average weight for the species ranges from 220 to 286 pounds. Pound for pound, Thylacoleo carnifex had the strongest bite of any mammal species living or extinct; a T. carnifex weighing 220 pounds had a bite comparable to that of a 550 pound African lion, and research suggests that Thylacoleo could hunt and take prey much larger than itself.

Tylosaurus :)