Ducks are way cooler than you think. They can sleep with one eye open, keep their feathers waterproof with a special oil, and yes—despite the old myth—their quack does echo. Ducklings even recognize their mom’s voice before they hatch, and some species can fly over 300 miles in a single day when migrating. The smallest duck in the world is only about a foot long, and in case you wondered: males are called drakes, females are hens, and the babies are, of course, ducklings. So.. quack you all!