What will the weather be like when swallows fly in the next three years?

It refers to the rainy weather, because the humidity in the air before rain makes the wings of insects wet. Therefore, the flying ability of those insects as swallow food is greatly affected, and they can only fly near the ground.

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. 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.