[Madclucker]

http://uk.news.yahoo.com/two-scottish-hens-undergo-full-sex-change.html

[Madclucker]

Just found this info

In a normal female bird only the left ovary is active. Due to infections or other problems, this ovary may cease to function. In that case the right overy becomes active, but for some reason produces more testosterone and causes the bird to develop male plumage and secondary sex characteristics, although it will never become fully male. Hens may begin to crow.


I don't know, Chickens never cease to amaze me 

[GrannieAnnie]

I knew chickens could change sex, but not the reason why, so thanks for that!