Mute swan (scientific name: Cygnus olor) is a large swimming bird, at 1250 ~ 1500 mm. Slender neck, forehead of a tumor warts protuberant, hence the name. The whole body white feathers. When swimming in the water, bending the neck and a bit like "S" shape. Mouth has obvious balls, and larger in male, the female is not very rich. Eyes are dark brown Black mouth orange, base and the ball Toes and web - colored. Live in lakes, rivers and swamps. On the ground to walk stupidly, but very good swimming. Will head straight flight, but seldom bark, so it is also named "silent swan". Aquatic plants as the main food, including grass roots, stems, leaves, buds, and seed; I eat software animals and insects and small fish. Nesting in the reeds, made up of aquatic plants and soil, the spread of weeds and plumule. Summer spawning 5 ~ 7, is one of the largest swan eggs; Egg blue-green, weighing about 340 grams; Done by females hatch, incubation period of 35 ~ 36 days. Parents to feed the brood birds. In Europe, north Africa, central and southern Asia.