A study of the world's highest-flying bird by Devon scientists may help improve treatment for heart attack and stroke victims.
As part of the research, bar-headed geese ran at speed on a treadmill inside a box.
The geese can breathe air consisting of just 7% oxygen, scientists at Exeter University found.
Tests with barnacle geese showed they did not have the same ability to cope.
'Astonishing tolerance'
Bar-headed geese are able to cross the Himalayan mountain range on their migratory flights between India and China, reaching heights of almost 24,000ft (7,315m).
Scientists at Exeter University said most people exposed to such conditions would quickly pass out.
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