Mother yaks seek higher altitudes for food, to protect young

06/19/2014 | National Geographic News (free registration)

Mother yaks climb extremely steep slopes to forage for food and keep calves safe from predators, according to a study. Grazing mothers have reached average heights nearing 16,000 feet, or about 4,800 meters, surpassing other childless females grazing on less steep slopes and leaving males behind in the valleys.

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