Bull moose antlers grow a half inch to one inch every day throughout the spring and summer, attaining an average weight of 50 to 60 pounds before they're shed every year in March. A closer relative to the bison than to the elk, pronghorn can run up to 40 mph and leap as far as 20 feet in a single bound. Often called buffalo, these relatives of domestic cattle were nearly exterminated near the turn of the century. The herds in Grand Teton and nearby Yellowstone National Parks are today's representative few of the millions of bison that once roamed the Great Plains. Although they appear calm and slow, bison can be quite dangerous when annoyed and can actually run faster than a horse.
Coyotes are about the same size as domestic collies.
Watch for them in meadows, where they often leap after tiny mice or voles. Trappers seeking their sleek fur nearly wiped out the beaver populations of Jackson Hole before the worldwide fashion for beaver hats collapsed in the 1840s. 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.