Why won't anything happen to birds like eagles when they fly in high altitudes as the air pressure is low
Answers
Answer:
Explanation:
The bar-headed goose's adaptations work well for occasionally spending short periods of time at high altitudes, but these may have high energy costs.
Bar-headed geese fly at elevations that would defeat most other birds. They raise goslings in Mongolia and Tibet and, come autumn, they soar high over the Himalayas into the Indian subcontinent. Although they take this – the steepest migratory flight of any bird – in stages, they cross the lofty mountain range at night in one marathon flight lasting seven hours. It’s easier to keep going once you are at that height than to land and take-off again and again. If humans did something similar, go from low to high elevations without a break, they’d suffer from altitude sickness and might even die.
Although it may seem effortless, flying sucks ten- to twenty-times more oxygen than resting. Flying birds gulp air, deriving oxygen to fuel their hard-working muscles. But this critical element is in short supply at high elevations, with only one-third to half the oxygen levels at sea level. Such a low oxygen condition is called hypoxia.
How then do the geese sustain their passage at 5,000 to 6,000 metres? Scientists even recorded one bar-headed goose flying at 7,290 m. Since flapping their wings saps energy, the birds glide once they reach cruising altitude. But they cannot coast indefinitely. Gravity pulls them down and they have to beat their wings to regain elevation.
In addition, the birds have to battle freezing nighttime temperatures while flying high above the mountains. Perhaps the cool air contains more oxygen and regulates body warmth better than the heat of the afternoon.
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