Ducks are a recurring race of animals in the Legend of Zelda series.
A single duck appears in this game. After Link finds the Flute Boy's Flute in the Haunted Grove, he can befriend the duck by playing the Flute in front of the Weathercock in Kakariko Village. Subsequently, any time Link plays the Flute in the Light World, the Duck will carry him to a location of his choosing. It is said that the duck previously did this for the Flute Boy as well. Predominantly, the duck may only be summoned in the Light World; however, after the second defeat of Agahnim atop Ganon's Tower in the Dark World, Link is able to summon the duck to chase Ganon to his last refuge at the Pyramid.
Ducks are found in Ordon Village and in the Fishing Hole. As a wolf, Link can talk to the ducks and learn certain things about the area. One duck in the Fishing Hole tells Link where to find the Sinking Lure, while another explains that people occasionally throw litter into the Fishing Hole which is why people occasionally reel in trash while fishing (thus explaining the sign telling people not to litter).