In a backyard in Erie, Pa., an unusual cardinal has appeared, displaying both male and female traits. Scientists say it may be a so-called gynandromorph. By Karen Weintraub A bird hopping outside ...

Exclusive video reveals half-male, half-female cardinal Birdwatchers in Erie, Pennsylvania, found an incredibly uncommon bird—in their backyard. ANIMALS WEIRD & WILD ...

The beautiful male cardinal bird in this hilarious YouTube clip is very interested in a female and is not being subtle about it! The obvious way he is checking her out may seem amusing to us, but ...

The beautiful male cardinal bird in this hilarious YouTube clip is very interested in a female and is not being subtle about it! The obvious way he is checking her out may seem amusing to us, but ...

As is typical with birds, the male's feathers are brighter and more flashy than the female's, which are often a muted brown ...

This ‘Extremely Rare’ Bird Is Half Female, Half Male The green honeycreeper is only the second of its species ever observed with this condition—and the first recorded in more than 100 years ...

The male and female nuclei go on to form the two separate halves of the same bird. In this scenario, the bird can be either sex on either side, depending on how the female's chromosomes are split ...

Writing in Proceedings of the Royal Society B, Schlicht et al. 1 support this idea by showing that the intense dawn chorus of male birds can be explained by the absence of female partners.