Created 3-Nov-12
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The Rocky Mountain bighorns and the desert bighorns of the Mojave and Sonoran deserts are descended from the wild sheep of Central Asia. Before the last ice age the ancestors of North America's bighorn sheep crossed the Bering land bridge from the Mongolia and Tibet.Desert bighorn are stocky, heavy-bodied sheep, similar in size to mule deer. Weights of mature rams range from 125 to 200 pounds (55 to 90 kg), while ewes are somewhat smaller. Due to their unique concave elastic hooves bighorn are able to climb the steep, rocky terrain of the desert mountains with speed and agility. Bighorn rely on their keen eyesight to detect potential predators such as mountain lions, coyotes, and bobcats, and they use their climbing ability to escape. Desert bighorn sheep typically live for 10–20 years. The typical diet of a desert bighorn sheep is mainly grasses.[3] When grasses are unavailable, they turn to other food sources, such as sedges, forbs, or cacti

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