How embarrassing. I made a wrong call and others had to correct me.
Duck stamps benefit wetlands all over the USA. There are fewer hunters around than there used to be but birding is a growing hobby with the same requirement for nature. Regardless of your feelings about hunting, consider buying a duck stamp. There is also the possibility to support the program and specifically point out that you do so as a birder via the American Birding Society. They sell the duck stamp here: shop.aba.org/index.php/federal-duck-stamp.html