I received two Australop "warmers" when I ordered my chicks. They are now 18 weeks. I can't figure out if they are roosters or hens, they do look different from the one hen that I did order, larger combs and very red. I haven't heard any attempt of crowing. What age do roosters find their voice? Here are recent pictures. They are 18 weeks. Look at the difference between them! Does anyone think the Australorps are roos?