Mute swans (Cygnus olor), mating behavior

animal animals aves behavior bird birds bodies body couple couples coupling cygnini cygnus day daylight daytime during exterior exteriors fauna female females kingdom lake lakes male males mating mute mute nature nobody of olor outdoor pair pairs photo photos reproduction shot shots swan swans swim swimming swims tetrapod the two vertebrata vertebrate vertebrates water waterfowl waterfowls waters wild wildlife world