2017-2018 Migratory Birds and Duck Stamps.

"One of the easiest ways that anyone can support bird habitat conservation is by buying Federal Duck Stamps - among the most successful conservation tools ever created to protect habitat for birds and other wildlife.

Federal Duck Stamps are conservation revenue stamps; 98 percent of the purchase price goes directly to help acquire and protect wetland habitat and purchase conservation easements for the  National Wildlife Refuge System. Wetlands acquired with Duck Stamp dollars help purify water, aid in flood control, reduce soil erosion and sedimentation, and enhance outdoor recreation opportunities..."
Duck Stamps

Federal Duck Stamp Program
"Federal Migratory Bird Hunting and Conservation Stamps, commonly known as “Duck Stamps,” are pictorial stamps produced by the U.S. Postal Service for the U.S. Fish & Wildlife Service. They are not valid for postage. Originally created in 1934 as the federal licenses required for hunting migratory waterfowl, Federal Duck Stamps have a much larger purpose today...

Federal Duck Stamps are a vital tool for wetland conservation. Ninety-eightEarly Duck Stamp Contest) cents out of every dollar generated by the sales of Federal Duck Stamps goes directly to purchase or lease wetland habitat for protection in the National Wildlife Refuge System. Understandably, the Federal Duck Stamp Program has been called one of the most successful conservation programs ever initiated and is a highly effective way to conserve America’s natural resources..."