| 1 | Unlike humans, bar-headed geese can breathe in and out very rapidly without getting dizzy or passing out. | |
| 2 | "Geese are a relatively old group of birds, and it's possible that when bar-heads first evolved as a species, the mountains weren't nearly as high as they are today, " Hawkes said. | |
| 3 | By contrast, the bar-headed goose reaches such lofty heights by flapping vigorously, if not gracefully. | |
| 4 | In 2009, Hawkes and an international team of researchers tagged 25 bar-headed geese in India with GPS transmitters. | |
| 5 | "Geese tend to honk a lot as they fly, " co-author Hawkes said. "We don't think of them as the most elegant of migrants. |
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