So true sourland, years ago when I first started keeping ducks one of my Scovy drakes killed another and I was so paranoid about letting any work out their differences after that, but I am older and wiser and know that things just happen and They were not where I could get to them to stop it, [still living at the river] I call them mine but actually they were dumped drakes living at the river below our home, Since then I have learned to let them go at it and will only step in when one is relentless and so far that hasn't happened here. They both look like plucked ducks right now from pulling each others feathers out but thankfully they are going into molt so they will be handsome guys again soon.Lydia makes a good point. It is essential that the loser have enough space to retreat from the victor. The only drakes that I have had fight 'to the death' have been muscovies. They just don't seem to give up.