Dzo

A yak crossed with domestic cattle, kept by herders in Tibet and Mongolia. Strictly, dzo is the male and dzomo the female, and only the females are fertile. Hybrid vigor is the whole point here. These animals are larger and stronger than the local yaks or cattle and are thought to give more milk and meat than either, which makes them a practical farm animal rather than a novelty. They also work as pack animals in the high country, including on the trek toward Mount Everest.