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以下圖文全摘自國家地理頻道

Rare half-male, half-female cardinal spotted in Pennsylvania



JEFFREY AND SHIRLEY Caldwell have been attracting birds for 25 years with carefully tended backyard feeders. But the lifelong Erie, Pennsylvania, residents have never seen a creature so wondrous as the half-vermillion, half-taupe cardinal—its colors split right down the middle—that first showed up a few weeks ago in the dawn redwood tree 10 yards from their home.

In fact, they weren’t sure they saw it correctly until it came in closer. “Never did we ever think we would see something like this in all the years we've been feeding,” Shirley Caldwell says.

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The anomaly is known as a bilateral gynandromorph. In plain language: Half its body is male and the other half is female. “This remarkable bird is a genuine male/female chimera,” says Daniel Hooper, a postdoctoral fellow at the Cornell Lab of Ornithology, in an email.

Gynandromorphs, known as “half-siders” among ornithologists, are rare but not altogether uncommon. They likely occur across all species of birds, Hooper says, but we’re only likely to notice them in species where the adult males and females look distinct from each other, a trait known as sexual dimorphism. “Cardinals are one of the most well-known sexually dimorphic birds in North America—their bright red plumage in males is iconic—so people easily notice when they look different,” Hooper says

HOW DOES IT HAPPEN?
Hooper says sex determination in birds is a little different than in mammals. In mammals, he says, males have one copy of each sex chromosome (X and Y) while females have two copies of the X chromosome.

In birds, it’s the opposite. Their sex chromosomes are called Z and W, and it’s the females that have a single copy of each (ZW), whereas the males have two of the same (ZZ). Sex cells’ nuclei, including sperm and eggs, usually have only one copy of either chromosome—males produce only Z-carrying sperm, and females produce either Z- or W-carrying eggs.

Gynandromorphy like that in this cardinal occurs when a female egg cell develops with two nuclei—one with a Z and one with a W—and it’s “double fertilized” by two Z-carrying sperm.

The chimeric individual then develops with half of its body as a male ZZ and the other half as a female ZW. If you were to examine a cell from the bright red male side, it would have cells with ZZ chromosomes. If you looked at a cell from the left, it would have cells with ZW chromosomes. This phenomenon happens in birds, many insects, and crustaceans.

Part of what makes this particular cardinal so exciting to Hooper is that it may be able to reproduce. “Most gynandromorph individuals are infertile, but this one may actually be fertile as the left side is female, and only the left ovary in birds in functional.”

We may soon find out. Shirley Caldwell says the cardinal is always in the company of a male. “We’re happy it’s not lonely,” she says. Researchers in western Illinois observed another gynandromorph cardinal several years ago and reported that they never saw it in the company of another cardinal (nor did it—or the Caldwells’ cardinal— ever sing).

In the meantime, the Caldwells get to observe this rare visitor from their kitchen window. They say it likes to feed on generous portions of black sunflower seeds and suet in a pole feeder not far from the lilac bush where it often perches.

"Who knows, maybe we will be lucky enough to see a family in summer!" Shirley Caldwell says.

太驚訝了,我小時候看過陰陽蝶的標本,我哥哥還曾經抓到過陰陽蝶,製成的標本據傳他還蒐藏著
沒想到鳥也有這樣的啊~


【发帖际遇】:紅峽青燦 走在大街上摔了一跤,竟然发现地上躺着 21F卡币 ,赶紧捡起来!

际遇事件仅作娱乐,正式设定请见【DL故事集】

 


快把萌燦抱回家!
笑著坦然展示一身淋漓的鮮血和殺戮的罪孽。心是烈火鑄成的。

这只鸟我记得去年微博上刷过它!这只好像是去年年底发现的
然后我记得更早的时候也看到过类似的新闻,搜了一下,发现历史上发现过不止一次这种鸟的雌雄同体WWWWWWWWWW
比如13年也有报导:http://niaolei.org.cn/posts/47502
蝴蝶的这种情况好像还比较多,大概是因为蝴蝶雌雄差异很明显,所以一半一半不一样看起来就很明显?
所以北美红雀也是类似的原因吧,因为雌雄一白一红很明显,所以也就发现得比较多WWWWWWWW
据说雌雄同体的家鸡发现得也比较多WWWWWWWW

有……有点好奇这些动物内脏结构是不是也是一半一半,它能不能自攻自受(X)WWWWWWWWWWW


【发帖际遇】羽·凌风 看见现行犯立刻上前捕捉,见义勇为被刀疤警长克莱尔·地皇鼓励,获得 20探险经验 !

际遇事件仅作娱乐,正式设定请见【DL故事集】
欢迎来到Dragicland,【总版规】请记得要看哦
如何回复?

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2018的年底吧WWWWWWWWWWWWW
13年那個簡直黑白郎君WWWWWWWWWWWWWWW
我也認為應該是因為雌雄顏色明顯的差異才容易發現,那種雌雄同型的動物,
比如說很多種類的海鷗吧,也許也有,但是肯定很難發現的WWWWWWWW

家雞跟人類那麼接近,又是那麼的雌雄異型,應該也很容易發現WWWWWWWWWWWW

我記得,小時候哥哥捉到的那個蝴蝶,尾部的毛筆器就只有一根,雄的那邊才有
只是小時候我很單純,沒有考慮過牠能不能自攻自受WWWWWWWWWWWWWWWWWW
所以也沒有仔細觀察WWWWWWWWWWWWWWW

快把萌燦抱回家!
笑著坦然展示一身淋漓的鮮血和殺戮的罪孽。心是烈火鑄成的。

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