Swans! Most are monogamous and stay together for life. Courtship behavior is rich, male and female will tend to make the same action, but also considerate of each other's feathers.

Stock photo: Swans! Most are monogamous and stay together for life. Courtship behavior is rich, male and female will tend to make the same action, but also considerate of each other's feathers. was taken by evathanksgod .