Do ducks quack upside down

Yes, ducks can quack while upside down, although it may sound different due to their position. Ducks often tip themselves over to feed or forage, and they can still produce their characteristic quacking sounds in this position. However, the acoustics and airflow may affect the quality of the sound. Ultimately, while they can quack upside down, the quack may not be as clear as when they are upright.