I am not sure what is wrong but my duck is not eating but is drinking water. He seems to be opening and closing his beak a lot and kind of staying away from the other ducks (1 male and two females) and just finding a place to sit down. He will get up and walk with them here and there. I am not sure what to do for him and I honestly am not sure he is even a male. I have never seen him try to mate with the females and for the first I thought he was female. I have added a youtube link to the video I took.