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.
The amazing “helicopter display” of a male Bronzed Cowbird is one of the avian world’s great spectacles, and it’s one that’s becoming better-known to U.S. birders, as the species has expanded its North American range in recent decades. Female cowbirds lay eggs in the nests of other bird species, and declines in numbers of Altamira and Audubon’s orioles in southern Texas have been attributed to the explosion in the Bronzed Cowbird population there. That explosion could be set to fizzle; winter climate space of this species in the United States is predicted to shift by 75% over the coming century, though most U.S.-breeding Bronzed Cowbirds currently winter in Mexico.