i need some advice here. We had three ducks in our pen...a welsh harlequin, a buff Orpington, and an Indian runner. Got them all as babies and they got along fine but then the welsh would bully the runner when the runner would be in the little pond we had for them. She would get on fop of her and bite at her neck and hold her under water. It didn’t happen all the time and at times the three would happily be paddling in the water. Well the other week we came home to find the all three in the water but the runner was rocking back and forth. We walked over to their pen which caused the other two ducks to hop out of the water and as they did they went right over her pushing her under. We immediately got her out and called our vet. She was bruised from her neck down to her tail and fortunately no major wounds. We have since rehomed the other two ducks but now realize the runner probably needs a friend. What would be our best solution? An adult? Another runner? Any help is greatly appreciated.