Taken from the Dream Moods website:
To see ducks in your dream represent your spiritual freedom (if flying) or the subconscious (if swimming).
They serve as a connection between the spiritual realm and the physical world.
Ducks are multi-talented animals in that they can walk, swim and fly.
Thus, a duck indicates your flexibility and your ability to blend and adapt in various situations.
Alternatively, the dream suggests that you are setting yourself up or being set up for the kill as associated by the phrase "sitting duck".
Are you being targeted?
Also, the duck may be a pun on "ducking" some issue or situation, instead of confronting it head-on.
Consider the phrase, "if it looks like a duck, walks like a duck, quacks like a duck, it's a duck".
Some things are too obvious to deny.
To see a white duck in your dream signifies falsehood and deceit.
To see a two-headed duck in your dream suggests that you need to be more grounded.
You need to thoroughly think through some emotional issue.
To see a dead duck in your dream refers to a pessimistic outlook.
You are set on a path that is destined for doom.