A new study shows that small birds migrating from Scandinavia to Africa in the autumn occasionally fly as high as 4,000 meters above sea level — probably adjusting their flight to take advantage of favorable winds and different wind layers.
A new study shows that small birds migrating from Scandinavia to Africa in the autumn occasionally fly as high as 4,000 meters above sea level — probably adjusting their flight to take advantage of favorable winds and different wind layers.