I have thats why I cautioned you, they are wonderful animals but when the hormones kick in they get crazy, I was so worried we were going to have to put my drake down because everytime i would walk outdside he would attack me just like the drakes do the ducks, if i turned my back he was flying onto my back, it was a nightmare, lasted till we got him the new ducks. he was about 5 months old when it started. Now he is awesome to have around but believe me it was me having to be very dominant with him, when he would come for me biting my feet or legs I would either pin him down or pick him up and put him on his back. He will still get bitie but it doesn't last long, I usually just push him with my foot and he waddles on off. But they are confused and need direction. When you say he is doing this to Ling it's the Muscovy drake mating behavior they are rough and she can get hurt, and over mated too so it would be best to get him a few more ducks to lavish his attention on. I still have a great relationship with my Drake buddy but he now respects me as his keeper not a mate. Mine also was left to die by his mama that is how he ended up being raised by me and my dh for 3 months.