Smallest organisms
With a mass of approximately and a length of 5 centimetres (2.0 in), the bee hummingbird ("Mellisuga helenae") is the world's smallest bird species and the smallest warm-blooded vertebrate. Called the "zunzún" in its native habitat on Cuba, it is lighter than a Canadian or U.S. penny. It is said that it is "more apt to be mistaken for a bee than a bird". The bee hummingbird eats half its total body mass and drinks eight times its total body mass each day. Its nest is 3 cm across.
Macaw
The largest macaws are the hyacinth, Buffon's (great green) and green-winged macaws. While still relatively large, macaws of the genera "Cyanopsitta", "Orthopsittaca" and "Primolius" are significantly smaller than the members of "Anodorhynchus" and "Ara". The smallest member of the family, the red-shouldered macaw, is no larger than some parakeets of the genus "Aratinga".