How do chicken breathe?

Chickens breathe using a system similar to other birds and mammals, but with some key differences:

1. Lungs: Like mammals, chickens have two lungs, but these lungs are relatively smaller and less spongy than those of mammals. They are also connected to air sacs.

2. Air Sacs: This is where the major difference lies. Chickens have nine air sacs that extend throughout their body, including their neck, chest, abdomen, and even into their bones. These air sacs act as reservoirs for air, allowing for a continuous flow of fresh oxygen through the lungs.

3. Breathing Mechanism: Chickens breathe through a series of movements that involve both the lungs and the air sacs.

* Inhalation: When a chicken breathes in, air enters the trachea (windpipe) and flows into the lungs and then into the air sacs.

* Exhalation: When a chicken breathes out, air moves from the air sacs back through the lungs and out the trachea.

4. Unidirectional Airflow: This is the unique feature of avian respiration. Because of the air sacs, air flows in one direction through the lungs, ensuring a continuous supply of fresh oxygen. This allows birds to extract more oxygen from the air compared to mammals.

5. Respiration Rate: Chickens have a higher respiration rate than mammals, typically breathing 15-20 breaths per minute at rest. This is due to their higher metabolic rate and the need to support flight.

In summary: Chickens breathe by drawing air into their lungs and air sacs. The air sacs act as reservoirs, allowing for a continuous flow of oxygen through the lungs. This unidirectional airflow is more efficient than the bidirectional airflow in mammals, allowing birds to take in more oxygen and support their energy-demanding activities.