Caribou and Northern Lights

Photograph by Alaska Stock Images

Caribou—such as this large-antlered specimen silhouetted by Alaska's northern lights—are being affected as global warming accelerates in the Arctic. In Greenland, caribou time their births to coincide with the blooming of tundra vegetation. But as climate change causes plants to peak earlier, caribou newborns that eat the plants face tougher odds for survival.