We live in Seattle where roosters are not allowed. So we bought our chicks from the local grange, that buys only sexed chicks. We've had them for 4 weeks, and turn off the lights for half an hour each day (as instructed in the Storey's Raising Chickens book). When I turned on the light yesterday, one of them crowed. It was a little chick crow, but it sure sounded like it was preparing for the real thing. We have two Rhode Island Reds and two Buff Orpingtons.