Mountain migration is a roller coaster for bar-headed geese

Adjusting altitude is less effort for birds than flying high

Flying goose

ROLLER COASTER RIDE  Bar-headed geese are adapted to fly at extremely high altitudes but prefer to keep lower when they can while migrating over the Himalayas.

Nyambayar Batbayar

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Bar-headed geese rise and fall with the terrain below them when they migrate, scientists report in the Jan.