Draw the outline of the head and body, perfect the swallow's body, and draw the swallow's tail like scissors.

Draw swallow's mouth, swallow's eyes and swallow's wings.

Draw the belly of the swallow and color it.

Introduction to 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. 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.

A slender body can reduce the resistance when flying. Swallow's wing shape has a high aspect ratio, which means that it can produce great lift and little resistance. However, this aerodynamic efficiency is at the cost of reducing maneuverability (for example, compared with short and wide wings), but this disadvantage is partially compensated by the forked tail, because such a tail can improve the maneuverability of birds.

The tail feathers of some species are very long, which can increase the lift. It acts like the flap of an airplane, ensuring the airflow to pass through the wings smoothly, and can delay the airflow when the swallow is ready to land, so that the swallow can stop flying without increasing the resistance. Most species have short tarsal bones and weak legs, which are suitable for inhabiting rather than walking, but those who dig holes or nest on cliffs have strong claws.