Faverolle Roo mated with my BSL and RIR

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My Salmon Faverolle mated with my BSL and RIR hens. I ended up with 7 baby chicks. Four black chicks and 3 yellow with red/silver wings. They are about 4 weeks old. How can I tell if they are roos or hen?

 

[The Moonshiner]

Wait 2 to 4 more weeks and post pics.

 

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[Auntiejessi3]