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.
For decades, forestry practices—emphasizing snag removal, salvage logging, and fire suppression—have negatively affected the Vaux’s Swifts arboreal nest sites. More recently, wildlife researchers are documenting sharp declines in this aerial insectivore’s prey base; even where suitable habitat exists, there may not be enough food. Now the species must contend with climate change. Audubon's climate model forecasts a 99 percent loss of the already beleaguered summer range. Unlike the closely related Chimney Swift, the Vaux’s Swift does not readily colonize artificial nest sites, so active management of western forests and their insect prey will be essential going forward.