I got these two mallards a month ago from a free range farm. I was hoping to get two females for eggs, but they were still young enough that they both looked exactly the same. I picked these two and hoped for the best that I picked females. Recently one of them started getting different feather patterns and the green head is starting to come in. The other still looks about the same as when I first brought them home. I was wondering if any of you experienced mallard owners out there could help me sex my two, along with ballparking their age if possible. (By the way I have no idea if these two are the same age or not). Any help would be greatly appreciated, as the curiosity is getting the best of me...LOL! Thanks!