I'm not certain if it works for everyone about how fast or slow tail development is to discern gender, but I was able to tell by it. Last year when we got our first 20 chicks, I watched them daily for any developments and I noticed one at around 3 weeks that kind of had slight difference than the others. I told DH I bet it would be a roo and I was right. One of the giveaways was it hardly had a tail (short and stumpy) while the others had tail feathers at least twice as long if not longer.How old are your chicks, Tap?
Is tail development really a good way to tell? My chicks are only a week old and just have the round fuzz butt. But I have 5 sex link pullets and I'll be comparing their tales to the SLWs.