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 .
Buttonquail
The buttonquails are a group of small terrestrial birds. The smallest species is the quail-plover, the only species in the genus "Ortyxelos", which is in length and weighs only . The buttonquails in the genus "Turnix" range from in length and weigh between . They superficially resemble the true quails of the genus "Coturnix", but differ from them in lacking a hind toe and a crop. The females of this family also possess a unique vocal organ created by an enlarged trachea and inflatable bulb in the oesophagus, which they use to produce a booming call.