This is my first time raising chicken chicks (have raised quail and ducklings). I unfortunately lost my favorite chick this past weekend so I think I might be worrying more about missing things because of my inexperience. I have three Blue Ameraucanas that I got straight run. They are about 2 1/2 weeks old. Two of them are almost exactly the same. The other is the one I'm wondering if I should be concerned about. It is much smaller than the other two, almost half the size. It also isn't developing its feathers as fast. It has no tail feathers and very few feathers on the wings. Behavior wise, it is the spunkiest of the bunch. It has no problems pushing the others out of the way to eat or drink. And it runs around with them with no problems. So what do you all think? Should I be concerned with this slow growth? Or is it normal for chicks of the same breed to develop at different rates? Is this maybe because they are different genders? Here are a couple photos. The little one is on the far left and one of its hatch mates is on the far right and the other in the upper right corner. (The cream colored one is an EE and is a week older than the rest.) In this photo the little one is on the right. You can see it has no tail feathers. The hatch mate is on the left. Thanks.