The correct option is A Ducks
Animals residing in the cold regions have a variety of adaptations for designed their survival. A common adaptation that all of the animals have are the thick layers of fat under their skin that act as an insulator against the cold. Except for duck, all of the animals posses this adaptation.
Duck has very thin layer of fat under its skin compared to these animals and also do not have enough features which could provide insulation against harsh cold weather.