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I understand that bears and pigs did that to survive but they changed from a herbivorous diet to a omnivorous diet. But how does a animal go from a plant eater to a pure carnviore. The animal I’m talking about is the marsupial lion. I was watching a documentary on it. And they said the marsupial lion ancestor was a plant eating wombat or kola, to fill the ecological predator niche. First off why did it evolve to be a predator when there where plenty of predators on Austurlia! A terror bird, terrestrial crocodile, giant snake, megalaina and thaylcines. Second why in the word is it name the marsipual lion and it dosent look like a lion! A lion has a man. While this animal has bolt cutter teeth. I don’t understand….. If I had saw the fossil remains of a marsipual lion I wouldn’t think it was a lion, . I probably think it was some mutated animal or alien, the last thing on my mind would be that it is a lion, who discovered this animal obvliousily never seen a real lion before . http://www.travelblog.org/Photos/4134171 does that look like a lion?