10 Facts about bison! How many did you know? 🦬 1. Bison communicate through vocalizations like grunts, snorts, and bellows, as well as body postures and behaviors. 2. Bison are the largest land mammals in North America, with bulls weighing up to 2K pounds and cows up to 1K pounds. 3. Despite their massive size, bison can run up to 35 miles per hour and jump up to 6 feet vertically. 4. Bison populations plummeted from 30-60M to less than 1K by the late 1800s due to overhunting and habitat loss.