The Ruddy Duck is a representative of the stiff-tail ducks, known for holding their spiky tails up in the air. They have large, flat bills, small wings, and feet set far back on the body. The male Ruddy Duck is cinnamon in color overall with a black head, large, white cheek-patch, and bright blue bill. The male in non-breeding plumage has a mottled gray body and gray bill. The markings on the head are similar to those of breeding plumage. The female is mottled gray overall with black on the top of her head and a dark, horizontal line that bisects her white cheek. Her bill is gray. The juvenile is similar to the female, but the black on its face is less pronounced.