In 1893, a one-million acre area of the grand canyon national forest reserve was home to an estimated 3,000 rocky mountain mule deer. cattle, sheep, and horses also roamed the reserve. in 1906, government hunters killed off hundreds of mountain lions, coyotes, and bobcats when the area was set aside as the grand canyon national game preserve. the number of rocky mountain mule deer rose to over 100,000 by 1923. what was the approximate density of the mule deer in 1923?