It doesn’t always take wings to fly high

By Sarah Zielinski, 17:46 PM February 13, 2014

Surviving at high altitudes is difficult for most living things because the air is less dense the higher you go. One consequence of this lower air density is less oxygen overall. Most human travelers to the top of Mount Everest (8,848 meters above sea level) will take advantage of portable oxygen, but some people manage the climb without any assistance.

Creatures with wings have an added problem when dealing with high altitudes: The lower air density makes flight a lot harder. Every flap of th...

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