Thin air does not demand a single solution. Four high-altitude mammals, the chiru, wild yak, kiang and snow leopard, face the same broad problem: oxygen is scarce, winters are severe, and food can be difficult to find. Each brings a different inheritance to the task.Insulation is only part of the bargain. The chiru, an antelope, wears exceptionally fine underfur that traps air close to its body, w...More