Breathing in Other Animals
•    Animals such as elephants, lions, cows, goats, frogs, lizards, snakes, birds have lungs in their chest cavities like the human beings.
•    Respiration in insects: A cockroach has small openings on the sides of its body. Other insects also have similar openings. These openings are called spiracles. Insects have a network of air tubes called tracheae for gas exchange. This type of respiration is      called tracheal respiration. Oxygen rich air rushes through spiracles into the tracheal tubes, diffuses into the body tissue, and reaches every cell of the body. Similarly, carbon dioxide from the cells goes into the tracheal tubes and moves out through spiracles.     These air tubes or tracheae are found only in insects and not in any other group of animals.


•    Respiration in Earthworm: Earthworms breathe through their skin. This is called cutaneous respiration.The skin of an earthworm feels moist and slimy on touching. Gases can easily pass through them. Though frogs have pair of lungs like human                 beings, they can also breathe through their skin, which is moist and slippery by the process of diffusion.