An elk walking along the rim at The Grand Canyon.
Elk are large members of the deer family, with males called bulls and females called cows. Bulls grow and shed their large antlers every year, and their calls, called bugles, can be heard from far away. They are herbivores that live in herds, are excellent swimmers, and are very active during dawn and dusk.
A Rocky Mountain bull elk foraging among the wildflowers. This photos was taken along Trail Ridge Road, the highest continuous paved road in the United States. It is 48-miles one-way across Rocky Mountain National Park and climbs to an elevation of 12,183 feet above sea level. Even in July there are still patches of snow.
A Rocky Mountain Elk Calf.
Pronghorn in North Dakota.
Pronghorns are fast, North American mammals known for being the second-fastest land animals, after the cheetah. While they might be second behind the cheetah in outright speed, the pronghorn can sustain it over a longer distance, and is capable of running 65kmph (40mph) for at least 11km (7 miles). They have excellent eyesight, live in herds, and are sometimes called "American antelopes" because they look similar to true antelopes.
However, its closest African relatives are the giraffe and okapi, and it is the only remaining species within its family.
