This is just so strange! The sex-change chicken that crows
http://www.dailymail.co.uk/pages/live/articles/news/news.html?in_article_id=383491&in_page_id=1770
A sex-change chicken which started life as an egg-laying hen has turned into a crowing cockerel.
The pet, called Freaky, spent eight months laying dozens of eggs until she crowed like a
bird one morning. Over the next few weeks, she sprouted a scarlet comb, grew red flaps called wattles under her chin and tufty tail feathers - all attributes of cockerels.
Animal experts said Freaky's sexchangewas a one-in-10,000 rarity. It happens when a damaged ovary causes the hen's testosterone levels to soar, turning the remaining ovary into a testicle.
Freaky, a silver-laced Wyandotte hen, now crows every sunrise, aggressively attacks other males and even tries to mate with his old female friends. (more at link)
