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.
The cute little Black-and-white Warbler can often be found hanging upside down or on the sides of tree trunks and large branches as it probes into bark crevices, much as a Brown Creeper does. The amount of climatically suitable space for it seems to be relatively stable, but a rather large northward shift is projected for both the possible summer and winter ranges and Audubon's climate model predicts only 17% of the current summer range will remain stable. This is a bird of forested lands, though, so any expansion onto what is currently Arctic tundra will be slowed by however long it takes for forests to become established there. Most Black-and-white Warblers winter in Middle America.