7-Week Update
In my totally newb-ish opinion, I still think I'm dealing with:
1 ISA Brown pullet (Rio)
1 RIR pullet (Daisy)
1 BR pullet (Poppy)
1 Golden Comet pullet (Sunflower)
1 BSL cockerel (Marlowe)
But please see the pics below and offer me second opinions, if you like. I'm a little unnerved by Sunflower's behavior. She bum-rushes the door every time I open it. Seems kinda ballsy for a pullet, but maybe she's just nuts. Meanwhile, Rio posed for her picture like a prima donna, and Poppy was uncooperative (although still the sweetest).
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