(1)
Common Name : Bar-headed Goose
Scientific Name : Anser indicus
(2)
Common Name : Greylag Goose
Scientific Name: Anser anser
The greylag goose (Anser anser), which lives on lowlands and cannot tolerate hypoxic conditions, presents a striking contrast to its close relative the bar-headed goose (A. indicus), which lives at high altitude and possesses high-altitude hypoxia adaptation.
Bar-headed geese cross the Himalayas on one of the most iconic high-altitude migrations in the world. Heart rates and metabolic costs of flight increase with elevation and can be near maximal during steep climbs. Their ability to sustain the high oxygen demands of flight in air that is exceedingly oxygen-thin depends on the unique cardiorespiratory physiology of birds in general along with several evolved specializations across the O2 transport cascade.
Bar-headed geese can be found anywhere from Mongolia to the Tibetan plateau in the summer, where they raise young before the majority take long flights south to the Indian subcontinent in the autumn, and return again the following spring.
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Негізгі бет Үй жануарлары мен аңдар Bar headed geese and Greylag geese, Gujarat | Nikon D500, 200 500mm | @arvindography
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