The smallest dabbling duck, the Green-winged Teal is smaller and more compact than other teals and has a round head and narrow bill. All sexes and ages have dark gray wings with green-black speculums and a brown bar above each speculum. Females and juveniles are mottled brown overall with gray legs. Males in breeding plumage have gray bodies with orange-buff, dark-spotted breasts and yellow patches on their flanks. Their rumps are black and buff, and their rufous heads have an iridescent green band swooping back in a curve on each side. They also have a vertical white shoulder-bar on each side, which can be a helpful field mark when trying to distinguish the Green-winged Teal from the Eurasian race.