The two main species of deer found in the United States are mule deer and white-tailed deer. Mule deer are mostly found west of the Rocky Mountains, but can also be found as far east as parts of North and South Dakota. While whitetails generally occur only to the east of the Rockies. Mule deer have a black-tipped tail which is proportionally smaller than that of the white-tailed deer. The male deer or bucks grow antlers annually. The mule deer have taller skinnier tines on their antlers where white-tailed deer typically have shorter thicker tines. White-tailed bucks are slightly smaller than mule deer bucks. [citation needed] Both of the species lose their antlers in January, and regrow the antlers during the following summer beginning in June. Although both species are found in the United States, where they are found is vastly different. Mule deer are found in the western United States in the foothills of the mountains.

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