This striking 3-ruble stamp from the Union of Soviet Socialist Republics (USSR), issued in 1990, forms part of the “Environmental Protection – Ducks of the USSR” series. It features the Red-breasted Merganser (Mergus serrator) in flight above a serene lake at sunset, with rich orange and violet tones contrasting the birds’ detailed plumage. The inscription “ОХРАНА ОКРУЖАЮЩЕЙ СРЕДЫ” translates to “Environmental Protection,” underscoring the theme of wildlife conservation. The right-side decorative tab continues the scene, showing additional mergansers gliding gracefully against a glowing sky — a fine example of Soviet nature-themed philately just before the dissolution of the USSR.