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.
List of birds of Leicestershire and Rutland
The storm-petrels are the smallest seabirds, feeding on plankton and small fish picked from the surface, typically while hovering. They nest in colonies on the ground, most often in burrows. There are about 20 species worldwide, two of which are rare vagrants to Leicestershire and Rutland.