ok, we are chick sitting for our neighbor. These were hatched by her third grade class and so she was just given two sets of eggs. (The first ones were refridgerated so they didn't think they would hatch...but low and behold three did, only two survived.) So the little brown ones are 4 weeks old and the black and white are 5 weeks. Any ideas as to breed or gender on any of these? The big ones are very naughty! they are chest to chest half the time. the little ones have cute feathered feet.