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 male of this species has a nearly invisible, iridescent maroon ring around its neck. All sexes and ages, however, have a bold white ring around the blue bill, making “Ring-billed Duck” a much better name. Ring-necked Ducks nest both in marshes and lakes in boreal forest. A projected major upheaval of climate in areas now covered by the latter may be responsible for the predicted 92 percent shift in summer range by 2080, as predicted by Audubon's climate model. The species’ winter range, however, looks remarkably stable, with variance of less than 10 percent in both range and available area, but potential major issues loom in the future in the summer season.