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(10-27-2016, 12:27 AM)Kingtheropod Wrote: You are forgetting about Arctotherium
In relation to section I, Arctotherium might have been slightly more robust (and quite heavier) than its North American counterpart, but on a pound-for-pound basis, both Agriotherium and the polar bear/Pleistocene Polar Bear are more robust (shoulder width vs body length).
Also, using this "robust" argument in favor of the brown bear will fail because both Agriotherium and the polar bear are at least twice the weight of an average brown bear today.
This means that the latter two may be more effective in terms of grappling than Arctotherium, and thus more able to defeat Arctotherium in terms of direct competition (if they both lived at same conditions). Arctotherium isn't that much heavier than Agriotherium and Pleistocene Polar Bear on average.