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Mammals: Breve with lungs
Mammals have a two-way breathing system which uses a diaphragm to pump air in and out of their lungs. Mammal lungs branch extensively, and their entire volume is filled with bubble like structures called alveoli. Mammals have the greatest lawn service area among animals.
Birds: Breve with lungs
In birds the lungs are structured so that the air flows mostly in only one direction. No stale air gets trapped in the system. A unique system of tubes air sacs in birds respiratory system enabled this one way airflow thus the gas exchange surfaces are constantly in contact with fresh air.
Insects:
In most insects a system of tracheal tubes extend throughout the body. Air enters and leaves the system through openings in the body surface called spiracles. In some insects, oxygen and carbon dioxide die fuse through the tracheal system, And in and out of body fluids in other insects body movements help pump air in and out of the tracheal system.