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.
A series of trills and buzzes, the complex song of the Brewer’s Sparrow can be heard on sage flats and in montane meadows of western North America. Audubon’s climate model predicts a noticeable decline in the summer season: only 24% remains stable, with a decrease of 73% in suitable climate space. One caveat: the Breeding Bird Survey data upon which the summer model is based does not touch on the population of “Timberline” Sparrow, a subspecies of Brewer’s in the Canadian Rockies. This bird is so similar looking, though, that it could be included in some of the winter projections, and most Brewer’s winter in Mexico.