Question

birds that fly at high altitudes need an especially efficient respiratory system.why?

Answer 1

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Respiratory system takes oxygen from outer body and evolve energy

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To fly in high altitude more energy is needed so greater the power of respiratory system energy to fly is more

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Answer 2

According to Peter Ward, a paleontologist at University of Washington, roughly around 175 million years ago, breathing the air at the sea level feels like the breathing in high altitude. The above mentioned time period is almost the time period of Jurassic creatures.

According to him the birds that are flying around high altitude posses the same characteristics of dinosaurs for breathing. He said that most of today modern world birds that are flying in high altitude have the characteristics of Saurischians dinosaurs which had the lungs that attached to a thin-walled air sac. He suggest that the breathing system of the Saurischians are evolved to survive a harsh environment and so the respiration system of high altitude birds.