Today, beaver continue building their dams and lodges in the creeks and lakes throughout Grand Teton National Park. They warn one another of an intruder's presence by loudly slapping their flat tails against the water. They have long, slender bodies usually less than a foot long. They feed on small rodents in brush or forests close to water. The large birds are recognizable by their black bellies and long, pointed black tails.
Males have a distinctive white breast and a black throat with a white necklace-like band.
During mating displays, the male can be heard making short, deep gurgling sounds. When flushed, the sage grouse clucks like a chicken. They are generally smaller than grizzlies, lack the shoulder hump, and have much narrower faces. Black bears are very common in the Rocky Mountains and greatly outnumber grizzlies in Grand Teton National Park. They weigh around 125 to 200 pounds.