hey! of course, they could be a variety of different breeds. i do have one question that may help narrow it down. where did you purchase them? from their coloring, head shape, and the darkest chick's markings, they look like red/golden sex links. often, hatcheries develop their own breed with a special name (think red star, amberlinks, golden comets, and ISA browns). they could be a wide number of different breeds, but from my experience, i'd go with sex links. hope this helps!