My duck has a hunched back, he is stumbling, and it looks like it’s a little difficult for him to walk there’s been a few times where I’ve had to get him under some water because he was laying on his back and it scared me I’ve had him since June 25th, 2024 it’s now august 12th 2024 I have two they are Swedish runner ducks I’m pretty sure he used to run around and was very active but now he really just sits in one spot I have them inside they’ve been living inside I feed them cracked corn they get water and I let them swim outside in their pool very often I just don’t know what’s going on someone help me please! ( they look wet in the photo because they just got done swimming)