I have a roughly eight week old black copper Marans cockerel who is suddenly acting like he can’t walk in a straight line he’s stumbling and laying down. He is in with three other same aged chicks who are showing no signs like this. His poop seems normal but he is lethargic and continues to fall asleep even as I brought him upstairs to check him out, I’ve never seen this before so please give me some advice he still stands in Pecks at things when I have him moving around But as soon as I leave him be for a minute he seems just to fall sleep.