Rooster Becomes Hen Due to Environmental Factors
Gianni started life as a red-blooded cockerel and would often wake his Italian owners up crowing on his farm in Tuscany.
But when a fox raided Gianni's enclosure and killed all of the hens inside, Gianni felt it was time for a change.
Within days the bird was laying eggs and trying to hatch them as he began his new life as a hen.
The sex-change chicken has baffled scientists at the UN's Farm and Agriculture Organisation, who are now planning to study Gianni's DNA to see what made him change.
An expert at the centre said: 'It may be a primitive species survival gene. With all the females gone he could only ensure the future of his line by becoming female.'
Professor Donato Matassino, who will be leading tests on Gianni, said: 'This rooster-hen will be taken to the laboratories of Consdabi for a series of behavioural and genetic tests.
'This will allow us to decipher this bizarre DNA mix up that appears to have literally given what looks like two chickens in one.'
Professor Donato said the cockerel-hen was transported by train to Naples where the laboratories are based.
Seriously wild stuff. Definitely going to be interested on the results of the testing that will be done.