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Nature & Environment

Bird's rare sex change stuns zoo

By T.K. Randall
April 11, 2012 · Comment icon 12 comments

Image Credit: CC 3.0 Stavenn
A Silver Pheasant at a zoo in Bombay has undergone a rare sex conversion, stunning zoo officials.
Although no anatomical changes have occurred, the once dimunitive female bird with dull brown feathers is now larger in size with the typical brightly coloured feathers that males use to attract females. In addition she no longer lays eggs and now fights with her former mate, behaviour indicative of male rivalry. Referring to the change as a case of "sex dimorphism", zoo director Renu Singh says that the incident has surprised most of the staff.
In a rare and a first-of-its-kind phenomenon, a Silver Pheasant, a bird belonging to the peacock family, has changed its sex from female to a male. Confirming this and terming it a kind of “sex dimorphism”, zoo director Renu Singh told IANS that the phenomenon had surprised most of the staff in the zoo.


Source: Phenomica | Comments (12)




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Comment icon #3 Posted by Simbi Laveau 12 years ago
I've raised pheasants since I was little. The older silver hens would sometimes change color to look like the males. I assumed this wasn't a rare phenomenon and just some sort of bird menopause. That makes a whole lot more sense than a sudden sex change of a mammal. Maybe plumage has to do with amt of certain hormones.
Comment icon #4 Posted by Darkwind 12 years ago
I've raised pheasants since I was little. The older silver hens would sometimes change color to look like the males. I assumed this wasn't a rare phenomenon and just some sort of bird menopause. You need to write the zoo and tell them your experience. I am sure they would be interested.
Comment icon #5 Posted by OiVey 12 years ago
New species... caster semenyaticus
Comment icon #6 Posted by The___Piper 12 years ago
Not resisting, what's your theory?
Comment icon #7 Posted by OverSword 12 years ago
Maybe it should enter the Miss Universe contest.
Comment icon #8 Posted by Mog 12 years ago
Clearly a hormonal issue. The bird was either exposed environmentally to hormone like molecules or the bird has a genetic defect leading to steroid resistance which could manifest after puberty at a time when hormone production is ramped up.
Comment icon #9 Posted by I Am Not Resisting 12 years ago
Not resisting, what's your theory? Well if you think about it, it seems it would be much easier to grow a peen than to have it sucked in and create a cavern. I know...not very articulate or mature of me. But it really does seem like a valid answer to me.
Comment icon #10 Posted by Knight Of Shadows 12 years ago
some frogs does that .. i guess .. and fishs but a bird .. maybe has something to do with the vet medications they used on it ? i don't know
Comment icon #11 Posted by Paracelse 12 years ago
Do they taste the same after the change??? :innocent:
Comment icon #12 Posted by Hatch 12 years ago
I've raised pheasants since I was little. The older silver hens would sometimes change color to look like the males. I assumed this wasn't a rare phenomenon and just some sort of bird menopause. I was raised on a farm and I've seen this happen when there was no rooster, one of the chickens would take over the roll of rooster. I thought it was very common....


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