Yes - Birds have Lungs - Due to their high metabolic rate required for flight, birds have a high oxygen demand. Development of an efficient respiratory system enabled the evolution of flight in birds. Birds ventilate their lungs by means of air sacs, structures unique to birds (and hence, perhaps dinosaurs, too). These sacs do not play a direct role in gas exchange, but to store air and act like bellows, allowing the lungs to maintain a fixed volume with fresh air constantly flowing through them.[1]
Yes. Bird lungs are more efficient than mammal lungs.
smaller
help it breath like any other being with lungs
Yes.
lungsPeacock is a bird. All birds breathe by lungs
Bird's have lungs, and no gills, because they are birds, which have lungs, and are not very aquatic. Some birds go underwater, like pelicans and penguins, but they have to surface from time to time. They can hold their breath for a long time, but they still have to breath occasionly.
An Ostrich is a flightless bird, and breaths through internal lungs.
with lungs you breath air and with gills you breath in water
claws
The left side of a bird's heart pumps blood to the cells.
The kiwi is a bird because it satisfies all the criteria of a bird. It is a warm-blooded vertebrate that breathes through lungs. It has feathers and lays eggs.
The right ventricle pumps the blood to the lungs.