Researchers at the University of Melbourne's Zoology Department discovered this earth-shocking bit of revelation: swans cheat. A lot.
"Swans have long been renowned as symbols of lifelong fidelity and devotion, but our recent work has shown that infidelity is rife among black swans," says Dr Raoul Mulder, whose team is busy fitting tracking devices to scores of swans.
DNA testing has shown that one in six cygnets is the product of an illicit encounter, smashing the birds' monogamous image.