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 seedsnipe
There are three subspecies of the least seedsnipe:The least seedsnipe is the smallest member of the Thinocoridae family. They have short tails and long pointed wings. Their legs and toes are a dull greenish yellow. The beak of the least seedsnipe is an ashy color and is conical like that of a finch or a sand grouse. Adult males have a gray face, neck, and breast, and have black lines at the center of the throat that form an inverted “T” shape. The eyes are a dark gray color.