North America’s largest and best-known land mammal is mesmerizing to look at but also aggressive and territorial, particularly during breeding season. American bison boast massive frames and piercing horns but are also fast and agile: they can run at speeds of up to 40 miles per hour and jump up to six feet.

There have been goring incidents in various national parks when humans have got too close, and the NPS says that bison have injured more people in Yellowstone than any other animal. It recommends staying at least 75 feet away.

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