Up until now our rooster has not had any problems and acting completely normal. This morning when we let him out of the coop, he started running around frantically. He acted like something was on him or chasing him around. All of our hens are acting completely normal, he is the only one doing this. After running around for a bit he stuffs himself in a small space and just stands there for a while. Then he continues running around again. He is being kept inside so he doesn't hurt himself worse by smashing against the pen like he was doing. His poop looks normal and he can walk just fine. The back of his comb looks like it is turning a dark purple or black color. When he was outside his pupils kept dilating rapidly, but that seems to have stopped now that he is inside. He seems completely fine now that he is inside, but if we take him back outside he starts running around again. He is eating and drinking just fine.