Elks have the largest population in Yellowstone, compared with other large mammals. Over 15,000 elks can be found in the park. They are a little smaller than moose with a weight of around 300 kg and height of 1.5 m at the shoulder. Bulls' antlers grow in spring and drop the next year around March or April.
Summer and autumn are great seasons to see elk in Yellowstone in large quantity. During winter the elks migrate to other places and refuges. The most popular time for elk watching is the mating season that occurs in fall, from early September to mid-October.
The peak of the rut usually falls on September. The call of the elk is an outstanding sound that attracts thousands of visitors. This is the time when elks gather in mixed herds. A large number of females watch several bulls showing their availability and power. Usually, they fight with each other and these battles can be really violent. They crash their antlers and push each other. The weaker bull gives up and goes away. During the rut you can watch elk in the northern ranges of the park, in Mammoth Hot Springs, and Madison River.
The calves are born in May and June. They are considered the cutest baby animals in the park.