I just went out to the coop to give a mealworm snack and I noticed my Rhode Island Red rooster had a hard time getting up and coming over to me. When he finally did get up, he was stumbling back and forth and side to side and sometimes falling. As I am fairly new to chickens, I have absolutely no idea what this is or if its contagious or how to treat or what...please help. I'm at a loss. I've looked online and can't seem to find anything real quick. He is 3 years old, eats a diet of 16% layer crumbles with fire choice grit and occasional mealworms...