Bison and elk are easiest to spot. But lucky visitors may also see grizzly bears, gray wolves, and moose.
Over the years, park officials have helped several endangered species. One of them is the bison. It’s the largest land animal in North America. By the late 1890s, the animals had been hunted to near extinction. Yellowstone officials helped rebuild the bison population. Today, more than 5,000 roam the park.