Murray Cooper / Torrent Duck (Merganetta armata) male on rock in stream, Ecuador

Murray Cooper / Torrent Duck (Merganetta armata) females along stream, Ecuador

Murray Cooper / Torrent Duck (Merganetta armata) females along stream, Ecuador

Donald M. Jones / Harlequin Duck (Histrionicus histrionicus) male and female in creek, Yellowstone National Park, Wyoming

Donald M. Jones / Harlequin Duck (Histrionicus histrionicus) male in creek, western Montana

Steve Baker / Blue Duck (Hymenolaimus malacorhynchos) standing on rock in stream, endangered, Kahurangi National Park, New Zealand

Jim Brandenburg / Wood Duck (Aix sponsa) quartet on snowy Judd Creek, Northwoods, Minnesota