The term 'DUCK's Milieu' refers to the natural habitat of a DUCK, which is typically a POND. A POND is a body of water that is smaller than a lake and is usually surrounded by land. Ponds are often home to a variety of aquatic life, including ducks. Ducks are well-adapted to living in ponds, as they can feed on the vegetation and insects found there, and they can also use the water for protection from predators.