Swallows can have other names.

Swallow (Swallow) is the scientific name of domestic swallow, which is the general name of 74 species of passeriformes. Small size, narrow wing tip, short beak and concave tail, weak feet and few feathers. Feathers are monochromatic, blue or green, with metallic luster;

Most kinds of men and women are very similar. Swallows spend a lot of time catching pests in the air. It is one of the most flexible birds, mainly feeding on insects such as mosquitoes and flies, and is a well-known beneficial bird. Nest in tree holes or cracks, or make holes in sand dikes, or stick mud on walls or protrusions of corridors, roofs, eaves, etc. In urban and rural areas. 3 pounds per work? Seven eggs.

biology

Appearance characteristics

Passeriformes (passeriformes): The general name of 74 species of birds in passeriformes. Some species are usually called Martins. Small and agile, the feathers are blue-black and shiny, the chest is dark brown, and the abdomen is milky white; Scissors with long pointed wings and forked tails; The mouth is flat and short, and the mouth is deeply cracked; Flying fast, preying on mosquitoes, flies, locusts and other pests during the flight; Keep making sharp and short calls. ? [ 1]?

The tail is concave, the beak is short and the feet are weak. Feathers are monochromatic, blue or green, with metallic luster; Most species are similar in gender.

Swallows belong to passeriformes 1 genus. This is a bird with a body length of 13 ~ 18 cm. The wing tip is long and the tail is forked. The back feathers are mostly gray, blue and black, so they were called mysterious birds in ancient times. The wing tip is long and good at flying, the mouth is short and weak, and the mouth is wide, which is a typical mouth shape of insect-eating birds. Short feet and strong claws. There are more than 20 species of domestic swallow, rock swallow, grey sand swallow, golden waist swallow and hairy foot swallow in the world, and there are 4 species in China, among which domestic swallow and golden waist swallow are more common.

References:

Baidu encyclopedia swallow