> Not much is known about the unusual phenomenon, but this sexual split has been reported among birds, reptiles, butterflies and crustaceans. From an article l

> Not much is known about the unusual phenomenon, but this sexual split has been reported among birds, reptiles, butterflies and crustaceans. From an article linked in another comment: https://www.nytimes.com/2019/02/09/science/cardinal-sex-gender.html https://www.nytimes.com/2019/02/09/science/cardinal-sex-gend...