The Mute Swan (*Cygnus olor*) is one of the world's largest and most recognizable waterbirds, native to much of Europe and Asia and widely introduced elsewhere, including North America. Adults are entirely white with a distinctive orange-red bill adorned with a prominent black knob at the base, which is more pronounced in males. Despite their name, Mute Swans are not truly silent — they produce hisses, grunts, and snorts, particularly when threatened — but they lack the loud, bugling calls of other swan species. They are graceful swimmers, often seen gliding across lakes, ponds, and slow-moving rivers with their long necks elegantly curved into an S-shape and their wings slightly arched over their backs in a posture known as "busking." Highly territorial, especially during the breeding season, they can be surprisingly aggressive defenders of their nests and cygnets. They mate for life, and pairs build large nests from reeds and aquatic vegetation near the water's edge, where the female typically lays 4–7 eggs. With a wingspan that can reach up to 7.9 feet (2.4 meters), the Mute Swan is a truly majestic sight and holds a special cultural status in many countries, including being the royal bird of England.