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.
Kikiki
Kikiki is a genus of fairyfly wasps containing a single species, Kikiki huna, known from Hawaii, Costa Rica, and Trinidad. At (150 µm), it is the smallest known flying insect. It is a close relative of wasps in the genus "Tinkerbella". It was discovered by entomologist John S. Noyes after he swept a mesh net through vegetation at Costa Rica's La Selva Biological Station.