For the casual observer, the bird in the photos below is just a slightly slovenly painted red cardinal. But for scientists and bird lovers, this is an incredibly rare find.

Fans of birds from Pennsylvania had the opportunity to observe in nature an ultra-rare anomaly – a bird of the species red cardinal, which combined the color of a male and a female (

According to scientific such a mutation is called Ginandromorphism and occurs when in one organism on some parts of the body dominate cells with male sex chromosomes, and in others with female.

Most often, this can be observed in insects, and in mammals and humans this is very rare and, as a rule, is not so pronounced.

Ginandromorphism in butterflies

The observed red cardinal Ginandromorphism was expressed very effectively, half of his body has a bright red color like that of a male, and the second is greyish-yellow like that of a female cardinal.

Spouse Geoffrey and Shirley Caldwell filmed this bird in the yard of their house.

According to scientists, such an anomaly could manifest itself in the case of double fertilization. This is when two different-sex spermatozoa simultaneously hit the nucleus of the egg.

"This wonderful bird is a wonderful specimen of the male and female chimera," says ornithologist Daniel Cooper of the Cornell Laboratory at Ithaca University, New York.

Such chimeras are usually infertile, although scientists assume that in some cases one of the parties, female or male, may prevail and thus the bird may have well-functioning female or male sex organs.

Earlier, a similar cardinal chimera was observed in 2008-2010 in Illinois. Scientists specifically followed the bird for 2 years to observe its way of life.

They also found out that the anomalous bird preferred to be an outcast. Either her relatives did not take her into the flock, or she herself felt uncomfortable among ordinary birds.

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