Who is the "King" of the bears?

[Polar]

I. Body/Skull Size

Skull sizes, body lengths/widths/girths/heights, and body weights will be compared between all species and genus of bears, from the earliest one (Ursavus) to all the modern ones. 

II. Prey Habits

Prey types and sizes of all these bears will be compared (e.g Agriotherium with ancient proboscideans, polar bears with walruses, brown bears with unglates...), how often they hunt these prey, how often they target the larger or smaller prey.

Hunting tactics will also be compared between all the bears.

III. Competition with Other Carnivores

What are all the bear species' relations to other felids, ursids, canids, amphycyonids, and any other known, prehistoric carnivore? Were any of them dominant predators or were they lower in the feeding chain?

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