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.
This sapsucker of the Intermountain West breeds in aspen forests in the mountains of the Great Basin and southern and central Rockies. In winter Red-naped Sapsuckers disperse to lower-elevation groves in the southwestern U.S. and northwestern Mexico. Audubon's climate model forecasts strong contraction and shifting of climate-suitable range in summer, but a near tripling of workable climate space in winter. In cases like this—a more favorable prediction for winter than summer—it is challenging to forecast overall population health. The species may flourish in winter, only to be held in check by increasing limits on population growth on the breeding grounds