Rangifer tarandus caribou
THE DEEP SNOW OF NORTH AMERICA’S SODDEN, PEAT-COVERED FORESTS has long kept competitors of the woodland caribou at bay. But warming temperatures draw in other deer—and wolves follow, eagerly decimating the caribou population. Their tundradwelling cousins—reindeer and caribou—are also threatened by changing weather. As sea ice retreats along their habitat, it evaporates, enters the upper atmosphere as moisture, and turns into intense rain that freezes atop the snow, trapping the plants they eat underneath a layer of ice. This vicious water cycle can starve to death tens of thousands of creatures at a time.