This little fella kept disappearing into the tall grass... Yellowstone National Park | T. Lyn Neufeld Photography

Once nearly wiped out, Yellowstone’s bison have made an epic comeback, now roaming in the thousands across valleys, riversides, and snow-packed meadows. These massive animals (bulls can hit 2,000 lbs!) are surprisingly nimble, able to sprint 35 mph, leap fences, and even plow through deep snow with their giant heads. They’re social too: summer brings huge herds and dramatic rutting battles, while winter scatters them into smaller groups near hot springs and rivers. Bison don’t just follow the “g