Recovering Native Birds Limited Edition The Limited Edition is the ultimate collectors item for this issue. See the full set of stamps in even more depth and detail and take a closer look at the statistics surrounding each bird. Learn about the conservation techniques and the unique evolution of New Zealand’s birdlife with a booklet written by Hugh Roberston, an ornithologist and author. There is a special numbered, perforated miniature sheet unique to the pack and a limited edition first day cover signed by Lou Sanson, the Director General of DOC.