The Federal Duck Stamp, formally known as the Migratory Bird Hunting and Conservation Stamp, is an adhesive stamp issued by the United States federal government that must be purchased prior to hunting for migratory waterfowl such as ducks and geese. It is also used to gain entrance to National Wildlife Refuges that normally charge for admission. It is widely seen as a collectable and a means to raise funds for wetland conservation, with 98% of the proceeds of each sale going to the Migratory Bird Conservation Fund.