There are 355 species in 104 families, 104 families and 1 family in the family Trochilidae. It is named because it resembles a bee when its wings vibrate. Small in size, covered with scaly plumage, brightly colored, and shining iridescent or metallic luster, male birds are more vivid; slender and straight beak, some downward curved, some species bent upwards; tongue flexibly; wings narrow and long; Tail tip, fork-shaped or racket-shaped; short feet, small and weak toes.
When flying, both wings flap rapidly, fast, powerful and durable; the frequency can reach more than 50 times per second. Good at hovering "stopped" in the flowers, and sometimes fly backwards. Closer kinship with Swift. Hummingbirds, like other birds, do not have a developed olfactory system and rely mainly on vision. About 90% of the food for hummingbirds comes from nectar, and the rest are arthropods, including flies, wasps, spiders, beetles and ants. Their thin, long beaks are great for nectar. Distributed in Latin America, north to southern North America, and along the eastern coast of the Pacific Ocean to Alaska.