Issued in 1990, this attractive Soviet Union commemorative set celebrates native wild ducks and wetland birds, highlighting the USSR’s late-period focus on nature conservation and biodiversity. The stamps depict ducks in flight over lakes, marshes, and reed beds, rendered in rich, realistic artwork typical of Soviet wildlife issues. Denominations include 5k, 15k, and 20k, each illustrating a different species and habitat scene. These stamps are popular with topical collectors of birds, fauna, and environmental themes, as well as specialists in late USSR philately, marking one of the final nature series before the dissolution of the Soviet Union.