BISON VIDEO: Officials at Yellowstone are saying it is bison mating season and the male bison are very aggressive right now. Remember to keep a distance of 25 yards from all bison and elk and 100 yards from other wildlife. Thanks to Yellowstone National Park for this video. Send us your photos and videos: nbcmontana.com/chimein | NBC Montana

These hardy bison try to keep cool in 100 degree weather. Montana is a land of extremes, with only a month or two of comfortable weather out of the entire year. | Michael Hodges, Author

BISON STAMPEDE: Thanks to Mark Townsend for sending in this video of bison running in Yellowstone National Park on New Year's Day! Submit your photos and videos here: nbcmontana.com/chimein | NBC Montana

BISON SURROUND CAMP IN YELLOWSTONE NATIONAL PARK: The following was posted on July 31 on the Yellowstone Tour Guides Facebook page - "A great backpacking trip up Slough Creek the past few days. WIldlife included bison, more bison and more bison. When setting up camp on night 1 the bison herd was more than a mile away. 5 hours later, they would have our tents surrounded, as the bison rut worked it way through our campsite. We were in the tents playing cards, while a light shower passed through, w

Bison herd migration.🦬🦬🦬 | Jake Slater

WATCH THESE BISON SWIM THE YELLOWSTONE RIVER 👀 This small herd of bison decided to take a nice cold swim this spring (notice the melting snow ❄️ on the riverbank) in the Yellowstone River! Bison are the largest mammal in North America. Male bison (called bulls) weigh up to 2,000 pounds and stand 6 feet tall, while females (called cows) weigh up to 1,000 pounds and reach a height of 4-5 feet. It's hard to believe these large creatures can swim but as you can see from the video they do just fine!

A bison herd is on the move across the plains, with new calves! Welcome, little ones. Sound up for real audio from the scene. #outdoors #nature #animals | Michael Hodges, Author