Bar-headed Goose

“The world's highest-flying bird, documented crossing the Himalayas at over 7,000 meters during migration. A testament to avian physiology at the extreme.”

The bar-headed goose performs one of the most extraordinary feats in the animal kingdom: a twice-yearly migration over the Himalayan mountain range. Satellite-tracked individuals have been documented crossing passes at elevations exceeding 7,000 meters — where oxygen levels are roughly 30% of sea level values. Human climbers require supplemental oxygen at such altitudes; the bar-headed goose breathes and flies.

The physiological adaptations enabling this feat are numerous. Bar-headed geese have hemoglobin with an unusually high affinity for oxygen, allowing more efficient oxygen uptake in thin air. Their flight muscles are richer in mitochondria than those of low-altitude relatives. Their lungs extract oxygen more efficiently during both inhalation and exhalation, a feature uncommon in birds.

The migration itself is remarkable for its speed — rather than ascending gradually, the geese often tackle the highest passes in a single sustained flight, climbing thousands of meters in a matter of hours. They breed at high-altitude lakes in Tibet, Mongolia, and Central Asia, then winter in the Indian subcontinent.

Gallery

Bar-headed geese at high-altitude lake

Photo: Wikimedia Commons

Vocalizations

Audio data from Xeno-canto · Quality grades A (excellent) — E (poor)