Arctodus.
The short-faced bear was the largest known mammalian land carnivore. Claw marks have been discovered on cave walls 15 feet off the ground. They weighed up to 2,000lbs. Their physiology suggests that they were incapable of swift turns and movements, disabling their ability to chase and take down the fleet-footed herbivores that they would have preyed upon, so they were most likely scavengers more than hunters, using their sheer size to scare smaller predators away from their kills. Grey wolves lived around the same time as Arctodus, but their efficient hunting strategies and social lifestyles meant that they were able to succeed these huge bears.

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