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The pronghorn is a small, deer-like mammal with black, pronged horns (Davis and Schmidly 1994). The horns are distinct in that they consist of a permanent bony core covered by a keratinous sheath, which is shed annually (Gorog 1996). The horns reach beyond the ear tips in males; in females are generally shorter, and seldom pronged. The horns of males average 250 mm (9.84 in), those of females average 120 mm (4.72 in). Pronghorn are usually reddish-brown or tan on top, and white below. They have a white rump patch and two white bands on the front of their throat. Males have a black mask and black patches on the side of the neck (Gorog 1996).