Mountain goat kid (Oreamnos americanus), Mt. Evans, Colorado. The mountain goat is an all-white, hoofed, large mammal with short horns and a fondness for living in rugged terrain. They are distributed throughout northwestern North America from Idaho and Washington to Southcentral Alaska. Single kids are born in late May or early June after a gestation period of approximately 180 days. Kids are precocious and can keep up with adults when only hours old and hardly larger than snowshoe hares. Kids usually remain with their mothers until the next breeding season. Mountain goats are ungulates which graze on grasses, herbs, and low-growing shrubs.