I have two white 16 week old Bantam Cochins who resemble roosters and spend their time crowing. However, today I heard what sounded like a distressed chicken so I opened up my coup to find what I thought was a rooster in the nesting box laying an egg. While I know this an undeniable sign of her being female, she in no way resembles a hen: This is her/him only a week ago, as well as a video of him/her crowing. As you can see the wattle and comb are very large and red, uncharacteristic of Cochin hens. I was wondering if hens could develop physical male characteristics? They were raised alongside a Leghorn rooster of the same age and developed these characteristics/started crowing well after the Leghorn, and I've heard of hens crowing in the company of a rooster, but never developing physical characteristics.