The land climate is relatively dry, so terrestrial animals usually have a structure to prevent water loss.

Animals on land are not affected by the buoyancy of water, and generally have organs to support their bodies and movements, which are used for crawling, walking, jumping, running, climbing and other sports in order to feed and avoid enemies.

In addition to earthworms and other animals, animals living on land generally have various respiratory organs that can breathe air and are located inside their bodies.

Land animals usually have developed sensory organs and nervous systems, which can respond to changing environment in time.

Annelids that live on land, such as earthworms, live in moist soil bags rich in humus, make their bodies crawl through the cooperation of muscles and bristles, and feed on organic substances such as dead leaves and rotten roots of plants. Body segmentation can make earthworm's body move flexibly. It has no lungs and trachea, and its breathing depends on the body wall that can secrete mucus and keep it moist all the time. The earthworm's body wall is densely covered with capillaries, and the oxygen in the air first dissolves in the mucus on the body surface, then penetrates into the body wall and then enters the capillaries on the body wall. Carbon dioxide in the body is also discharged from the body surface through capillaries in the body wall. Animals need a temperature suitable for their life. Earthworms can't keep a constant body temperature, so they can only live in deep soil bags with little temperature change.

Land animals and mammals. Their body hair is smooth and soft, with heat preservation function; Breathe with the lungs; The heart is divided into four chambers with two circulation paths. Constant body temperature; There are front teeth, molars and canine teeth; There are developed cranial nerves and limbs.

There are many land animals. However, the morphological structure and physiological function of any living thing are adapted to its living environment.