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.
Least sandpiper
The least sandpiper ("Calidris minutilla") is the smallest shorebird. The genus name is from Ancient Greek "kalidris" or "skalidris", a term used by Aristotle for some grey-coloured waterside birds. The specific "minutilla" is Medieval Latin for "very small".