-Has he actually killed any birds or drawn blood?
-When you say all of their feathers how many is all?
- Is he creating large bald patches of are there just some feathers laying on the ground?
-How many hens and how many drakes do you have?
Is this your first time with a drake? I only ask because I had someone (first time drake owner) call me freaking out saying their drake was going to murder their duck and here the drake was acting like any typical drake would. Ducks mate in water and do not have hands. This ritual to an inexperienced duck owner might appear as drowning or mistreatment, but is just how ducks mate. The drake will hold on my grabbing the back of the females head and push her under. This is why it's important as duck owners that we create an environment where the drakes and hens can live in harmony. By that I mean ensuring we have correct drake to hen ratios (1 drake to 4 hens for docile drake and more for more aggressive drakes), separating any extra feisty drakes during heavy mating seasons and last but not least never keep a drake with chickens. The drakes penis is cork screw shaped and will rip apart a chickens reproductive system. Sorry to be blunt, but when a drake injures a chicken it's not the drakes fault it's whoever put them together.