The grizzly bear, also known as the brown bear, is probably the most feared animal in North America. This powerful predatory genius can stand 7 feet tall and weigh more than 800 pounds. Its strong limbs and huge paws can easily kill a man in a single swipe, and its powerful crushing jaws allow it to feed on a variety of foods, including large mammals. Grizzlies are also strong swimmers and fast runners. Coming face to face with this animal in the wild can be a harrowing experience, but the best response is actually to stand tall and resist the urge to run. These animals have been clocked at more than 40 miles per hour, and running away from them can trigger their chase response.