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.
Where there are cliffs and canyons in the American West, there are White-throated Swifts. These birds’ nests are generally safe because of their inaccessibility, and populations are stable in most areas. Range extension northward into British Columbia has been documented, and climate change is thought to be at play. While showing some potential expansion in both season, Audubon's climate model projects a 73 percent loss of current summer range by 2080. Potential expansion may be difficult for the species to realize for two reasons. First, the species requires steep rock faces for nesting and roosting. Second, it will not flourish without a strong aerial prey base—a resource known to be declining in many regions.