Sexing chicks?

[Hegatha]

I am wonder at what age is it the easiest to tell the sex. I know at one day its really easy but mine are about 10 tens old and wondering when they will start to show more?

 

[Chick_In_The_Burbs]

6-8 weeks was when I could mostly tell with mine. Some of the experts on here might be able to tell earlier with good pics though. I think early sexing for chicks has to be vent checking on day 1 or chicks that are 'sex links' anyway. But the only sure way to know though is when they start crowing or laying! I've seen a couple of threads on here where the chick was thought to be a hen for months only to crow on a fateful morning!