I try to collect one nice cover from every country in the world, and I need YOUR HELP! Below you can browse through my collection, if you see your country is missing (or you can send me a better cover than the one I already have), please contact me :)
I prefer covers with WWF stamps, because this is my main (topical) collection. I also collect other WWF items, like local FDC / MC etc.
Eagle owl (Bubo bubo) and Steller's eider (Polysticta stelleri). In 2013 there has also been an issue 'Aland Loons and Grebes', but I don't have items with these stamps yet.