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 yellow-headed species breeds only in the conifer-covered mountains of the Pacific states of the Lower 48. The main current threat to the Hermit Warbler is hybridization and competition with the closely related Townsend’s Warbler, which is invading from the north. With Audubon's climate model projecting a 60 percent loss of current summer range by 2080, climate change adds another threat. The bird may be forced up the mountains to follow ideal climate, and it can’t ascend forever. Since almost all Hermit Warblers winter in the pine-covered mountains of Mexico, additional data from south of the border will be crucial for ascertaining the effects of changing climate on its winter range.