Male and female birds are often quite different. Looking at two individuals of radically different color, it’s sometimes easy to forget this. I often talk to people who think they have multiple ...

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A cardinal that is half male and half female was spotted in Levy County, Florida and confirmed to have bilateral gynandromorphism ...

Researchers have spotted an “extremely rare” green honeycreeper in Colombia that’s half female and half male. The bird’s plumage is divided directly down the middle, with blue feathers ...

An Australian study reveals a surprising phenomenon: male birds laying eggs due to sex reversal. Researchers found that some ...

A rare half-male, half-female cardinal sighting last week in western Pennsylvania has birders and scientists across the state a-twitter. Seasoned birder Jamie Hill, of Waterford, Erie County, snagg… ...

Known as a bilateral gynandromorph, longtime birder Jamie Hill described it as "a bird divided right down the middle, half male and half female." ...

A striking and extremely rare half female, half male bird has been spotted by a University of Otago zoologist.

Sexual dimorphism is when the male and female of a single species look very different physically. This is relatively common in birds, such as peacocks, turkeys and birds of paradise.

An "extremely rare" half-female, half-male bird has been caught on film, a sighting that has only been made once more than 100 years ago.