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How do birds breathe?

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Birds have lungs and air sacs, which direct air through the lungs in a one-way air flow. THis one way air flow lets birds maintain a high metabolic rate.

They have lungs and tiny nostrils at the top of their beaks, used for breathing.
This is the plain and simple answer

Like us, birds need to breathe air in and out of their lungs in order to fulfill the cycle of bringing oxygen into the body to be used in metabolism and also to take the waste CO2 away from the body. However, unlike us, when a bird breathes the air does not go simply in and out of the lungs in a simple u-shaped path. Instead birds' have a number of large extensions called 'air sacs' and hollow (pneumatized) bones all interconnected to their lungs. These allow the air to flow around in a grand circle meaning birds can have fresh oxygen rich air in their lungs all the time Also unlike us mammals, a bird's breathing is not driven into and out of the lungs by means of a diaphragm. In birds, breathing is controlled by muscular contractions of the ribcage that reduce or increase the overall size of the body cavity and thus force air out of the various air sacs.

Air is breathed in through two nostrils situated at the base of the bill (except in Kiwis where they are at the tip of the bill and gannets where nostrils have become redundant and breathing is through the mouth). This air enters the 'trachea' then passes down the throat until it reaches the syrinx (a bird's vocal chords). Here the trachea divides into two 'bronchi' before passing through the lungs. This freshly inhaled air goes first, not to the lungs, but to the abdominal air sacs. These are the largest and most important of a bird's air sacs. Some of this inhaled air goes to the posterior air sacs also.

When the bird breathes out this air moves from these air sacs into the lungs. When the bird breathes in again, this air moves from the lungs to the interclavicular, thoracic and anterior air sacs. When the bird breathes out a second time the air passes up the bronchus and out of the bird's system. Thus it takes two breaths and not one for air to pass in and out of a bird's respiratory system. Also important to note is the fact that air passes right through the lungs, this allows for an almost continuous flow of air over the 'alveoli' and for a greater exchange rate in gases. This exchange rate is also enhanced by the fact that bird alveoli are 10 to 100 times smaller than ours giving a far greater surface area per volume for gaseous exchange to take place.
Like us, birds need to breathe air in and out of their lungs in order to fulfill the cycle of bringing oxygen into the body. Air is taken in through the mouth and nasal openings of the bird.
yes
Birds have a nose and a mouth just like humans and just like us they breath from there nose and possibly their beak.
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Do birds breathe?

Yes, that is why their chest poofs out and sucks in

How does a bird breath?

Birds breathe with lungs, in and out through beak and nostrils - pretty much like we do. Some have a sort of secondary system as well, with air sacs and even their hollow bone

How do cardinal birds breath?

Nope, they were physically unable. They held it in their whole lives. As you can imagine, they became very constipated. It got so bad that by around 785973859787859205 BC, the