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800-pound grizzly bear Brutus is the curious best friend to renowned naturalist Casey Anderson, who has raised him since birth. Together, they've set out on a yearlong mission to chronicle the lives of Yellowstone's vulnerable grizzly bears.

Imagine that your best friend has a head the size of a beach ball, and dinner-sized paws with six-inch daggers on the end of each finger that could kill you in one swipe?