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 unique species breeds somewhere few humans will ever go: dense, mosquito-infested spruce bogs. Many birders prefer, instead, to find them mincing around in the undergrowth during migration in places like Chicago in May or New York City in October. Audubon's climate model projects a total shift in summer climate space--with none of the core range stable or included by 2080. It appears, however, that a good deal of the new space is currently Arctic tundra, and black spruces are famously slow-growing trees. The model does not make any winter projections, as Connecticut Warblers winter in South America.