The duck is a type of bird native to the planet Earth.
In 2285, when the U.S.S. Enterprise entered the Mutara sector, they were engaged in combat by a Klingon Bird-of-Prey commanded by Kruge. During the attack, they had lost control of their ship, and James Kirk said: "So, we're a sitting duck." (Star Trek III: The Search for Spock)
Ducks were among the animals brought by the Bringloidi when they were evacuated from their planet by the USS Enterprise-D in 2365. (TNG: "Up The Long Ladder")
In 2372, Captain Kathryn Janeway likened the constant, minor attacks by Kazon raiders on the USS Voyager to being "pecked to death by ducks". (VOY: "Basics, Part I")