Kingfisher generally refers to the genus Kingfisher. The birds of the genus Kingfisher (scientific name: Alcedo) are medium-sized waterbirds, blue-black from the forehead to the pillow, densely mixed with emerald blue horizontal spots, brilliant emerald blue on the back, chestnut brown on the abdomen ; The top of the head has a light-colored horizontal spot; the mouth and feet are red. From a distance it looks like a woodpecker. Because the feathers on the back and face are bright blue, it is commonly known as the kingfisher. The food is mainly fish, and it also eats crustaceans and a variety of aquatic insects. A total of 15 species, 48 subspecies. There are 3 species in China: Great Spotted Kingfisher, Blue-eared Kingfisher and Common Kingfisher. The last one is common and widely distributed.