so, I've had this duck for about a week or two. I think he was hit by a car but I didn't see it happen and the only problem is his leg, so IDK. he can't move his leg at all, and he doesn't seem to be any better. he can hop around on his good leg but he can't get far. he isn't flying anywhere so I'm not sure if he can or not. he's not eating much, despite having enough food, but he's still alive so I'm sure he's fine there. his joints seem to bend okay but I'm no veterinarian so I could be wrong. he seems to have everything he needs to survive, but he's not showing any signs of getting better. what should I do here? am I doing enough? if you need more info, just ask. thanks!