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 former species was split into Bell’s Sparrow and Sagebrush Sparrow in 2013. There are two forms of Bell’s Sparrow: one that breeds in coastal-slope chaparral and one (“Mojave Sparrow”) that breeds on inland flats centered on the Mojave Desert. When the three forms are combined, Audubon's climate model predicts a significant decrease (of 65 percent) and shift in summer range (of 88 percent). Specifically, the range of “Mojave Sparrow” appears to be completely lost—probably very bad news for this population. The model projects a largely stable and potentially expanding winter climate space for the three populations.