Swallows are beneficial birds for human beings, mainly feeding on insects such as mosquitoes and flies. A swallow can prey on more than 500,000 pests and protect crops in one summer. 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 characteristics of swallows: the collective name of 74 species of passerine birds. 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. 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.

2. Swallow, whose scientific name is domestic swallow, 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. Each lays 3~7 eggs.

3. Swallow's living habits: Swallows are most willing to get close to humans, and humans also like this kind of beneficial bird best. Generally, they return to farms near farmland (insects) for breeding from April to July. Domestic swallows nest under the eaves of farmhouses. Most of these nests are made of saliva-bonded soil and grass stalks, covered with soft weeds, feathers, rags and so on. And some Artemisia annua leaves. The bird's nest is dish-shaped. Breeding 2 nests every year, mostly from May to early June and from mid-June to early July. Each nest lays 4~6 eggs. The second nest is less, 2~5 pieces. Eggs are milky white. Males and females hatch eggs together. 14 ~ 15 days, the young birds hatch and are fed by their parents together. The chicks fly out in about 20 days, and then feed them for 5~6 days, so they can feed themselves. The food is full of insects. The golden waist swallow is similar in shape to the domestic swallow, but slightly larger. This swallow has a chestnut waist, which is very eye-catching, and a small black line in the lower body, which is easy to distinguish from domestic swallows. Habits are similar to those of domestic swallows, but most of them live in mountain villages.