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Why are some birds able to fly at high altitudes?

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Birds that are able to fly at high altitudes have evolved specific adaptations that enable them to cope with the challenges of flying in thin air. These adaptations include efficient respiratory systems that can extract oxygen more effectively from the air, specialized wings and body structures that enhance lift and maneuverability, and unique metabolic processes that help them maintain energy levels at high altitudes. Additionally, some birds have the ability to enter a state of torpor, reducing their metabolic rate during rest periods, which can be beneficial when flying in oxygen-poor environments.