I am chick sitting for these 21 chicks while a friend of mine is on a cruise. We are going to split them up 50/50 when he returns. I have done some research but it is hard to tell sometimes the breed. These are about 3-4 weeks old I believe. Any help in identifying the breed of these will be appreciated. This one may be a rooster and is the only one like it in the bunch. His colors makes me think he maybe a rooster. I believe the white one is a Leghorn, the red ones could be Red Star sex-link, the dark one in the middle facing the camera is possibly a Barred Rock or even a Dominique?? The underbelly was a little lighter color when I first got them a week ago. There legs are yellow little wash of grey, and they do have a spot on top of their head and the colors are checkered, mainly black but with white tip feathers. I have no idea what the black/white spotted one with grey legs is (it is the one in the top of the picture). There is a better picture of him below. Thanks in advance for the help. I can try to get better pictures if needed.