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Hi there. I have been birding most of my life and am currently a grad student working on a bird migration study. "A bird does not sing because it has an answer. It sings because it has a song."
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rhamphotheca:

Bar-headed Goose (Anser indicus)

Bar-headed geese have to reach extreme heights when they migrate over the Himalayas. To be able to do this, the species is physiologically and biochemically adapted to flying at altitudes where oxygen levels and temperatures are both extremely low. 

Did you know? Bar-headed geese can fly higher than Mount Everest making them the world’s highest flying birds.

(via: BBC Nature)

(photo: T - John Downer, B - Diliff)

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