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Despite common belief, grizzly bears arent one single species. Instead, they are any North American subspecies of brown bear, including the mainland and peninsular grizzly, as well as the Kodiak bear. In fact, scientists often refer grizzlies as North American brown bears. History: Grizzly bears are notorious for being more aggressive than other bear species, but this is largely in part due to how fiercely grizzly bear mothers defend their cubs.