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Supermom: Grizzly Bear
Grizzlies and brown bears are fierce defenders of their cubs, chasing away predators including male grizzlies, who are known to kill babies in order to mate with mama (not smooth, fellas). Their protective nature stems from having the lowest reproduction rate among all mammals in North America; grizzlies typically birth two or three cubs every five years. Brown bears, many of which are a heftier version of the same species, can be found in many of Alaska’s national parks, but in the Lower 48, grizzly bears are currently only found in Glacier, Grand Teton and Yellowstone, with a handful or fewer remaining in North Cascades.