Black-legged kittiwake (Rissa tridactyla) Mating or Copulation, UK Black-legged kittiwake (Rissa tridactyla) Mating. After all the courtship rituals, and the acceptance of a nest site, twigs grass and fresh moss, two birds copulate. Even this part of the breeding season has it's own intamacy. The courtship riual is one thing but actual copluation holds its own little intimate moments.
