This is a beautiful stamp souvenir sheet, issued by Guinea-Bissau in 2010, honoring the World Wide Fund for Nature by displaying stamps on stamps. Featured animals shown include the Bonobo, Pygmy Chimpanzee, Princess Parrotfish, African Manatee, Shortfin Mako Shark, European Turtle Dove, Green Turtle, and the Plumbeous Warbler, among others. The sheet is Michel catalog #4815/Bl.807, and is Post Office fresh, mint never hinged, and F/VF.