We know that ducks swim with their feet but when a diving duck needs to get somewhere fast, it flies underwater with its wings.
The BBC Earth video below shows common eiders (Somateria mollissima) at an Arctic polynya, diving to eat mussels.
Watch them swim with their wings.
(video from BBC Earth)
Same as penguins. They “fly” underwater too.
Oh my gosh! I literally held my breath as they were floating back to the surface! Looks like the muscles are kind of hard to dislodge too. Cool. Thanks Kate.