<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (May 2008) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (May 2008) (Learn how and when to remove this template message) </Td> </Tr> <P> 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 . </P> <P> President Herbert Hoover signed the Migratory Bird Conservation Act in 1929 to authorize the acquisition and preservation of wetlands as waterfowl habitat . The law, however, did not provide a permanent source of money to buy and preserve the wetlands . On March 16, 1934, Congress passed, and President Roosevelt signed, the Migratory Bird Hunting Stamp Act, popularly known as the Duck Stamp Act . </P>

When do you need a federal duck stamp