The red-shouldered macaw (Diopsittaca nobilis) is named for the red coverts on its wings. It is a small green South American parrot and the smallest macaw, being 30–35 cm in length. It has two distinct sub-species, the Noble macaw and the Hahn's macaw, and one third subspecies similar to the Noble Macaw but has longer wings. The Hahn's Macaw is not only the smallest of the macaw species, but is the smallest member of the Red-shouldered Macaw group. The main colour distinction between these three is that the Hahn's Macaw has a black bill, as opposed to the pale cream coloured upper beak on the other two. The red shouldered macaw is native to the tropical lowlands, savannah, and swamplands of Venezuela, the Guyanas, Bolivia, Brazil, and far south-eastern Peru.