I'm not sure if this is serious, but all 3 of my chickens (2 Ameracaunas, 1cochin mix) have been having dark blue poop for a few months now, since the beginning of summer. None have had any blue foods. It is also slightly runny. I would appreciate it tremendously if someone more advanced in chicken medicine could help me out here. Thanks! P.S. They have been eating many yellow flowers off our bushes lately.