Getting colder in your town? It certainly is in New York—but the musk ox (Ovibos moschatus) could handle it. When the weather gets foul, its strategy is to stay and cope. Unlike Arctic caribou, musk oxen do not migrate seasonally. Instead, their squat, woolly bodies limit heat loss, even when temperatures plunge below -40°F (- 40°C)! Study of ancient DNA reveals that over many millennia, musk ox populations have undergone repeated boom and bust cycles in response to climate fluctuations. Being able to rebound after population collapses may have helped musk oxen survive the end of the Ice Age when most other large mammals, like woolly mammoths, died out.
Photo: Per Harald Olsen/NTNU