I have been planning on getting some chicks for about 5 months now. I went to tractor supply yesterday and bought 6 babies. I took 2 and my next store neighbor took 4. they are rock pullets from what the man said at the store. but what is a rock? they are yellow and still the cute fluffy looking things. but what is a rock? I don't think they are barred rocks or Plymouth rocks. is there such thing as a white rock? please help!