Multimedia Gallery - The researchers' findings are described in the Jan. 16, 2015 issue of the journal <em>Science</em>.

cover of the journal science jan 16 2015

January 15, 2015

The researchers' findings are described in the Jan. 16, 2015 issue of the journal Science.

Bar-headed geese (Anser indicus) flying above the Tibetan Plateau. Rather than migrate high above the ground at a steady altitude, these birds fly only as high as the undulating terrain requires. This flight path keeps them in relatively dense air and reduces energy expenditure. Measures of heart rate and wingbeat frequency confirm that the birds usually fly comfortably within their physiological capabilities. See page 250.

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