For 2018, artists should include a hunting-related accessory and/or portray the theme "Celebrating Our Waterfowl Hunting Heritage." Designs may include hunting dogs, hunting scenes, and/or waterfowl decoys, and may feature national wildlife refuges as the background of habitat scenes. Non-eligible species, or other designs that depict uses of the stamp for sporting, conservation, and collecting purposes are optional.
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https://www.flickr.com/photos/usfwshq/sets/72157679322206893/