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 handsome species is by its very nature ready to utilize new habitat. It is strongly dependent on outbreaks of spruce budworm, and has very large clutches (six on average) to take advantage of these unpredictable and ephemeral food sources when and where they do happen to occur. Audubon's climate model shows an 89 percent loss of current summer range by 2080. Spruce budworms need spruce trees, though, so in order for the Cape May Warbler to expand its range, it will need the spruce forests to spread north quickly onto what is now Arctic tundra.