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.
Any effort to protect the Willet must first acknowledge that there are two highly distinct populations of this hefty sandpiper: inland breeders (called “Western Willets”) that winter widely on ocean coasts; and coastal breeders (called “Eastern Willets”) that winter largely south of the United States. Audubon's climate model forecast of a 70 percent loss of current winter range by 2080 refers mainly to the inland/western birds. The model shows potential expansion northward and inland, but areas of wintering habitat along the coasts are also threatened with sea level rise and development.