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.
Activity characteristics and living habits:
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.
Swallows are most willing to approach humans, and humans also love this beneficial bird. "Returned to the island in the spring, weaving willow bit mud to cut the rain fly. Don't go near the rich and the people, whispering and hugging "(Heshui Zuo). Swallows usually return from the island to the farm near the farmland (insects) to breed 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.