What birds have two lungs?

Respiratory system of a bird
 
 



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Unlike the lungs of a mammal, birds haveLungsthat are continuously flowed through by air. The Air sacs ensure the continuous flow of air in the lungs. Most birds have six pairs of air sacs. From the rear air sacs the unused air flows from the back to the front into the lungs and gets into the front air sacs, from where the then used air into the windpipe is directed. The chest is responsible for filling and emptying the air sacs. This respiratory system is far superior to that of mammals; a bird can breathe three times more air than a mammal of comparable size.
 
Like mammals, birds are animals of the same temperature. Your heart is also two-chambered. Your body is thermally insulated by the feathers and a layer of fat in the subcutaneous tissue. They have a body temperature of 41 ° C to 44 ° C. In contrast to mammals, their cardiovascular system is much more efficient. Birds drink very little so they don't have to drag water around in a bladder when they fly. They excrete uric acid as whitish crystal pulp with the feces. This saves you water. However, they have to eat a lot in order to compensate for the high energy demand that flying costs.