it might quack you up!
• All ducks have highly waterproof feathers as a result of an intricate feather structure and a waxy coating that is spread on each feather while preening. A duck's feathers are so waterproof that even when the duck dives underwater, its downy underlayer of feathers will stay completely dry.
• Most male ducks are silent and very few ducks actually "quack." Instead, their calls may include squeaks, grunts, groans, chirps, whistles, brays and growls.
- pertaining to, situated in, or forming small or narrow spaces or intervals between things or parts.
- Anatomy. situated between the cells of a structure or part: interstitial tissue.