This is a beautiful souvenir sheet, issued by Mozambique in 2012, featuring extinct marine animals. The stamp includes an image of the Caribbean monk seal (Monachus tropicalis), while the sheet includes images of the Steller's sea cow (Hydrodamalis gigas), the Cephalaspis lyelli, Asteroceras sp., and Orthoceras sp. The sheet is Scott catalog #2599, and is Post Office fresh, mint never hinged, and F/VF.