I bought three Easter Egger pullets that were (supposed to be) 11weeks old but they were all different sizes. I just assumed that they were different ages. This morning I heard a crowing like sound coming from the coop. I'm not sure which lady (I'm hoping) it was. Here is Martha on the right with a bigger comb than Merideth (martha is the biggest). They're about 15 weeks old. Any gender distinction?