I'm glad I came across this thread because it's possible that I have 4 Cornish Rocks in my brooder right now. I picked up 6 new chicks at TSC yesterday and - because the TSC people put all the chicks together in one big tub
- and because yellow chicks were almost all that was left - it was impossible to know exactly what kind of yellow chicks we were getting. The employee that helped me said that some could be Cornish Rocks and I said I don't want any meat birds, to which she replied, "They're just like regular chickens."
This thread will be very helpful if I see any starting to grow by leaps and bounds.