Male cardinals are red. Female cardinals are tan. The odd bird that's been roosting outside John and Shirley Caldwell's kitchen in Erie, Pennsylvania, is an even split of both. Divided down the middle ...

Every once in a while, a genetic anomaly will occur in the animal world that blows scientists’ minds. Take, for example, the exotic bird in the image above. It’s “gynandromorphic,” which means a ...

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. Zoologist and professor at the University of Otago in New ...

Bird banders in Cook Township banded a one-in-a million bird — a rose-breasted grosbeak with half its body looking like a male and the other half, a female. The bird was banded on Sept. 24 at Carnegie ...

Thanks to the developmental fusion of male-female bird twins into one individual, this northern cardinal is half red and half tan -- split lengthwise down its middle -- and is half male and half ...

Bilateral gynandromorph green honeycreeper (Chlorophanes spiza) photographed in the wild in Colombia. (Credit: John Murillo.) An “extremely rare” half-female, half-male bird has been caught on film, a ...