My Banty Mix rooster started dragging his wings on the ground about a week ago, and he hasn't gotten any better. Now, when anybody pecks him, he flips over onto his back and can't get up. He can't even jump a foot off the ground to the lowest roosting perch anymore. I found him this evening (on his back), dusted him for lice, and put him in a crate for the night. Anybody know what might be wrong? Note: It's been really, REALLY, hot and humid here all summer. I thought that might help with the diagnosis.