Location in Oregon
Blue is Winter range - Red is Summer range
Purple is Year-round range - Yellow is Migration range

Ring-necked Duck

Aythya collaris - Common in woodland ponds. In winter more confined to fresh water than other bay ducks. The vertical white stripe on the side and solid black back are best filed marks of the male. Female can be told by its distinct narrow white-eye ring, ring bill, and broad gray wing stripe.