Female roseate terns sometimes mate with each other for life, allowing themselves to be fertilised by males, but making nests and bringing up their young together.

• 雌性粉红燕鸥有时会与同性伴侣共度一生，她们会让雄鸟为自己授精，但却与同性伴侣共同筑巢，养育幼鸟。