1, Swallow (Swallow) is a general term for 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. They are one of the most flexible birds. They mainly feed on insects such as mosquitoes and flies, and are well-known beneficial birds.

3. Swallows nest in tree holes or cracks, or drill holes in sand dikes, or stick mud on walls or protrusions of corridors, roofs, eaves, etc. As nests in cities and rural areas. Each lays 3 ~ 7 eggs.