The promiscuous bird that uses yellow petals to win a mate

Countries & Cities · Published 9 October 2026 Swipe more like this →

In short: Meet the superb fairywren, a bird that defies traditional mating norms. While they form stable social pairs, these birds are sexually promiscuous, often mating with multiple partners. To woo a female, the male performs a peculiar courtship ritual: plucking bright yellow petals to present as a gift.

The superb fairywren (Malurus cyaneus) is a common sight across south-eastern Australia, thriving in everything from dense undergrowth and woodlands to suburban gardens in cities like Sydney and Melbourne. Despite their small size—averaging just 14 cm in length and weighing between 8 and 13 g—they possess complex social structures. They are socially monogamous yet sexually promiscuous, meaning that while they maintain a pair bond, they frequently mate with other individuals. Interestingly, these extra-pair partners may even assist in raising the resulting young.

Visual identity is a key part of their survival and social signaling. Males exhibit striking sexual dimorphism; during breeding season, they sport a brilliant, iridescent blue forehead, ear coverts, and tail that contrasts sharply with a black mask. This blue is particularly vivid because the feathers reflect ultraviolet light, a spectrum visible to other fairywrens. In contrast, females and non-breeding males appear in a much more subdued grey-brown or fawn plumage, a trait that once led early observers to incorrectly assume all dull-colored birds were female.

The species has a storied taxonomic history. First collected by surgeon William Anderson in 1777 off the coast of Tasmania, it was initially placed in the genus Motacilla because its tail resembled European wagtails. Over time, it has been reclassified multiple times—from flycatchers to warblers—before finally being placed in the Maluridae family in 1975. Modern DNA analysis has further refined our understanding, revealing that the superb fairywren's ancestors diverged from the splendid fairywren approximately 4 million years ago.

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