I have a silver phoenix bantam rooster that's about 6-7 months old. I always thought his behavior was kind of strange, but now he has taken a turn for the worse. He seems to be stiff or slightly paralyzed, and he hobbles slowly and his wings droop unevenly. Today he got stuck on his back and couldn't get up. He still hangs around with the other chickens but lays around a lot more as well. I don't think his weight has changed much but he has always been pretty lightweight. I have isolated him from the other chickens. I am scared that this is Mareks but I thought that Mareks came on suddenly, while this has been going on for a long time. Please help!