The darker the color, the more favorable the climate conditions are for survival. The outlined areas represent approximate current range for each season. More on reading these maps.
Numbers of Double-crested Cormorants have increased quite substantially in some parts of North America in recent decades, due to decreased persecution and banning of pesticides like DDT. Audubon’s climate model for this species predicts a significant shift in summer climate space by 2080—only 21% of the core area remains stable, and much of the shifting summer climate spaces moves northward into what is currently the boreal forest of Canada. Cormorants are not boreal forest breeding birds, and it remains to be seen if they are able to adapt to the changing climate.