Postage stamp collecting

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Fish, Game & Duck Stamps
Site with Fish, Game (hunting) & ducks stamps reference catalogs.

National Duck Stamp Collectors Society
An organization based in the USA devoted to ducks stamps

Richoux, Howard - Fish, Game and Duck Stamp Collectors' Page
Online catalog of stamps with fish, ducks stamps, and a hunting theme. Contains links to a dealer site if you wish to purchase items from the catalog

National Wildlife Galleries - Federal, State, International, and Junior Duck Stamps
Sells mostly duck stamps, they also have fish, grouse, turkey, quail and pheasant stamps. Order by credit card over the telephone, contact information can be found at their site.