00:00Imagine you're a duck, flying higher than the clouds. 21,000 feet up, the air is thin and
00:05freezing, and the mountains below look like tiny toys. But your wings keep beating, strong and
00:11steady, carrying you over peaks most animals will never see. A mallard once flew that high,
00:17higher than many mountaintops. Would you dare to fly where the air is almost gone?
00:22Follow for a new duck fact every day.
