I have a delaware roo probably 5-6 months old. He won't walk, tries to get up and lays back down. He is eating cracked corn from my hand and the ground and I just saw him take a drink. no blood or apparent injuries, crop doesn't feel hard but also isn't full enough to see well so I don't know if he ate before I gave him the corn. I have him separated in a cage and he just lays there. Comb is red and looks okay. Any ideas on what I can do or check?