How bird can fly at very high altitude without any shortage of oxygen
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1. It seems that migrating birds do fly at high altitudes, but most of them seem to be well within the range that humans regularly climb/hike without supplemental oxygen(I myself have climbed/hiked at altitudes up to almost 14k feet). However there are some birds that fly up to 29k feet(the altitude of Everest) but according to this link the lungs of birds are able to extract much more oxygen than mammal lungs, allowing them to breathe at very high altitudes.
2. Even humans are anabel to breath at very high altitudes"
you say "even humans" as if there's something special about us.
"climbing the everest mountains requires artificial respiratory instruments"
No, people can climb Everest without oxygen. It's pretty much the limit of what we can do, but it is possible.
In order to supply enough oxygen to their muscles to power their flight, birds have much more efficient lungs than us.
In the same way that we don't usually need lungs good enough to climb Everest, but we can because there's some spare capacity (to keep us going when our lungs are not working as well as they should) the birds may well have enough "spare" capacity to let them fly over Everest.
Source :- Google
2. Even humans are anabel to breath at very high altitudes"
you say "even humans" as if there's something special about us.
"climbing the everest mountains requires artificial respiratory instruments"
No, people can climb Everest without oxygen. It's pretty much the limit of what we can do, but it is possible.
In order to supply enough oxygen to their muscles to power their flight, birds have much more efficient lungs than us.
In the same way that we don't usually need lungs good enough to climb Everest, but we can because there's some spare capacity (to keep us going when our lungs are not working as well as they should) the birds may well have enough "spare" capacity to let them fly over Everest.
Source :- Google
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