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 flycatcher
The least flycatcher ("Empidonax minimus"), (also called chebec, or chebecker, after the sound it makes), is a small insect-eating bird. It is the smallest "Empidonax" flycatcher in eastern North America.