Down Source is a term used to refer to the collective group of waterfowl species that are commonly found in the Northern Hemisphere. These species include ducks, GEESE, drakes, and eiders. Ducks are small-bodied birds with short necks and webbed feet. GEESE are larger than ducks and have long necks and webbed feet. Gooses are similar to GEESE but are smaller in size. Drakes are male ducks and eiders are sea ducks. All of these species are important sources of food for humans and other animals.