What do the terms „waterfowl“ / „landfowl“ stand for?

In a wider sense, waterfowls are bird species whose habitat is especially contingent on waters. In relation to bedding products, only ducks or geese are regarded as “waterfowl”. Only their plumage is suitable as filling material for bedding products.
 
In the area of bedding products, especially chicken and turkeys are understood as landfowl (also “pawing poultry”). Their feathers – they do not posses any down – are not suitable for bedding products due to their small filling power.
 
Quelle
Verband der Deutschen Daunen- und Federnindustrie e.V.