I have three Easter Egger chicks that were born on June 11th and are about 10 weeks old. One of them - which I thought was a girl until recently - just mounted one of my barred rock hens. Is this something that they normally do at this age? I thought the males would start doing that in another month or so. This particular chick was always smaller and started to mature MUCH later than his brother. I knew his brother was a boy about a month ago. He's starting to catch up now, but his feet are still smaller and for a long time his tail seemed to be shaped more like a hen's.