Over 90 species of mammals call Grand Canyon National Park home, giving this park higher mammalian species diversity than Yellowstone. From the largest land animal in North America to some of the highest bat species diversity in the United States, Grand Canyon is home to a far larger mammalian population than many people think. Most visitors to the park see mule deer, elk, and squirrels, but many of Grand Canyon's mammals are secretive or nocturnal and move around unnoticed. ×.