We purchased 6 baby "girls" from Orschelns last week (2 RIR, 2 Buff Orp, and 2 Americauna) Guessing they're about 2 weeks old now. How is it that they "know" which are pullets and have them seperate from the straight run? Ours are all said to be pullets but is there a chance that there might be a roo or two in there? If we all have such a time with sexing them when they're 6 weeks old and such, how does Orschelns know???