Newborn ducks will take on the characteristics of the first animal they see. If the first animal they see is a human, then they will think they’re human and grow up thinking they’re human. This is called “imprinting” and it’s the natural instinct to follow the first thing they see.
Some ducks have been observed floating through tidal rapids or fast-moving sections of rivers, and when they’ve reached the end, they hurry back to the beginning to ride over and over.
There’s a debugging method that uses rubber duck.
Only female ducks quack; the males coo,hoot,honk, and grunt, but not quack.