A British hen named Freaky has left many confounded after turning into a male rooster.

She was born over a year ago as a special breed Silver Laced Wyandotte hen. However, after laying dozens of eggs, Freaky started developing masculine characteristics.

A distinctive red comb appeared on her head and her behavior became more aggressive. Now she crows and has grown rooster feathers to lure other hens.

Freaky's owner, Jo Richards, a smallholder from Saltford, near Bristol, says, "It's so funny. One morning, out of the blue, she just started crowing."

However, although Freaky now looks like a male rooster, he is not capable of becoming a father.

A hen-to-rooster change in sex is caused by soaring testosterone levels and is approximated to be a one in 10,000 rarity.