Hummingbird
Hummingbirds are birds native to the Americas and constitute the biological family Trochilidae. They are among the smallest of birds, most species measuring in length. Indeed, the smallest extant bird species is a hummingbird, the bee hummingbird weighing less than .
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.