Shouldn't Roo's Be Crowing By Now?

[mtnhomechick]

I got 13 RIR's on May 19th. Three of them have large combs that really stand out. I am thinking they are roosters because they act like roosters.....keeping the hens in line. I am thinking if they are they would be crowing by now. Since I ordered pullets I am hoping they are not roo's but keep listening for the crow.

 

[mtnhomechick]

I am wondering if they would be crowing by now........anyone know?