I got a chick from the pullet bin at TSC. However, I am wondering if its behavior is indicating it is a roo? It is the most aggressive of the 3. It likes to jump up on top of the EcoGlow and then chirp as loudly as it can!!! Would that lead one to think it will be a roo? It is only about 3 days old. Thanks in advance for any thoughts on this! Ok, Editing to add picts! The yellow one is the one in question. She/he was in the pullet bin with the red one. Also, I don't know what any of these are as far as breed! Any ideas on that?