Hens or Roos?

[walknhorse]

Can anyone help me determine whether these are hens or roos? Thank you.

 

[Gray Farms]

All males

 

[Cyprus]

All cockerels

 

[BantammChick]

Roosters!

 

[MykaMom]

Cockerels. Comb, tail give them away.

 

[walknhorse]

Thank you everyone! I was pretty certain the top two are roosters. The bottom two had me stumped. I heard and saw both of them crow yesterday but I heard some hens can crow as well. You folks are awesome!