Domesticated yaks (Bos Grunniens or the grunting ox) are thought to have been domesticated by Qiang herdsmen on the Tibetan (Qinghai) Plateau around 4,500 years ago. The Tibetan culture of the Himalayan Plateau is intertwined with yak just as Native American Plains Indian culture is intertwined with the American Bison.
Zebras are a keystone species in the Kalahari; they are a source of food both for predators such as lions and for scavengers such as brown hyenas and whitebacked vultures. Shown here are birds surveying an injured animal on the Makgadikgadi grasslands. (Adrian Bailey).
Zebra Mussel (Dreissena polymorpha). Zebra Mussels are an invasive species that have inhabited Wiscsonsin waters and are displacing native species, disrupting ecosystems, and affecting citizens' livelihoods and quality of life.ebra Mussel (Dreissena polymorpha). Zebra Mussels are an invasive species that have inhabited Wiscsonsin waters and are displacing native species, disrupting ecosystems, and affecting citizens' livelihoods and quality of life.