Swallows spend a lot of time catching pests in the air and are one of the most flexible passerines. They mainly feed on insects such as mosquitoes and flies and are well-known as beneficial birds. They build nests in tree holes or crevices, or drill holes on the beach, or stick mud to walls or protrusions of corridors, roofs, eaves, etc. in urban and rural areas to make nests. 3∼7 eggs are laid each time.
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[Appearance]
A collective name for 74 species of birds in the family Hirundinidae (order Passeriformes). A few species are commonly known as Martin swallows.
It is small in shape, with pointed and narrow wings, a concave tail, a short beak, and weak and small feet. The plumage is solid or metallic blue or green; both sexes are similar in most species.
Swallows are a genus of the family Passerine. This genus of birds is small, with a body length of 13 to 18 centimeters. The wing tips are long and the tail is forked. The back feathers are mostly gray-blue-black, so it was called a black bird in ancient times. It has long wing tips and is good at flying. It has a short, weak beak with a wide slit, which is the beak shape of a typical insectivorous bird. The legs are short and have strong claws. There are more than 20 kinds of swallows in the world, including barn swallows, rock swallows, gray sand swallows, golden-rumped swallows and hairy-footed swallows. There are 4 species in China, among which barn swallows and golden-rumped swallows are more common.
