Hello, I am new here as of tonight. I have had a run of 15 asst. chicks this past summer but my boyfriend got them before I moved south so I didn`t get to see them as babies and learned to tell by the feathers next to tail if hen or roo. Well I just got a run of 15 Black Australorp an 15 RIR, is there anyway to tell at 1 week if they are hens or roo`s? I can`t post pictures yet but have them on my blog or can email someone them. Any help would be wonderful and I look forward to learning from you all. Thank you.