Is this a roo?

[Terrie Mac]

Suspecting Atilla the Hen is a roo...5 weeks old. Is she a he?

 

[tiki244]

That is a pretty big comb for 5 weeks. However, if this is a RIR than I think you can wait 3 more weeks to be sure. By then you should be able to see some hackle feathers (sharp or rounded) to be sure.