4 weeks old black australorp : hen or roo?

[grisou]

I have 6 baby chicks, all black australorps. They are raised by a Silkie. Even if 4 weeks old is probably a little bit too early, I think there are still some way to know if one chick is hen or roo. Thanks all for your help! David.

 

[Bertram]

#1 is male and maybe #5. The rest look female.

 

[MandyMusshafen]

I'd say #1 is definitely a boy. The rest look like girls to me!