Female and immature Cinnamon Teal are notoriously difficult to distinguish from Blue-winged Teal. Cinnamon Teal is always larger-billed than Blue-winged. They also have a warmer-toned face, whereas Blue-winged Teal has colder, gray tones and a bolder facial pattern. Green-winged Teal has a slimmer bill and more boxy head. Their overall body color on females is darker brown, with a darker stripe through the eye and darker cap. Green-winged Teal in any plumage lack the pale blue upperwing coverts of Blue-winged Teal, Cinnamon Teal and Northern Shoveler.