Nail-biting footage from a hiker captures his close encounter with a powerful grizzly mama bear as it stalks him to protect her cubs

Grizzly bears are among the most dangerous animals in North America, thanks to their immense size, strength, speed, and bone-crushing bite. Grizzly bears (Ursus arctos horribilis) are a North American subspecies of the brown bear (Ursus arctos), dist... [1625 chars]