Hummingbird
Hummingbirds are birds native to the Americas and constitute the biological family Trochilidae. They are among the smallest of birds, most species measuring in length. Indeed, the smallest extant bird species is a hummingbird, the bee hummingbird weighing less than .
Red-shouldered macaw
The red-shouldered macaw ("Diopsittaca nobilis") is a small green South American parrot, a member of a large group of Neotropical parrots called macaws. The species is named for the red coverts on its wings. It is the smallest macaw, being in length. It is native to the tropical lowlands, savannah, and swamplands of Venezuela, the Guianas, Bolivia, Brazil, and far south-eastern Peru. It has two distinct subspecies, the noble macaw and the Hahn's macaw, and a possible poorly distinct third subspecies that has longer wings, but is otherwise similar to the noble macaw. The Hahn's subspecies is named for German zoologist Carl-Wilhelm Hahn, who in 1834 began compiling "Ornithologischer Atlas oder naturgetreue Abbildung und Beschreibung der aussereuropäischen Vögel" (Engl: Ornithological Atlas or natural depiction and description of birds from outside Europe).