Mountain migration is a roller coaster for bar-headed geese
Adjusting altitude is less effort for birds than flying high
![Flying goose](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/01/kb_bishop11HR_credit-Charles-Bishop_main.jpg?fit=860%2C460&ssl=1)
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