I have 5 ducks, and theyve always gotten along great. Now, for some reason one female has been singled out! She sstays to herself, but when one male gets a hold of her hea pulling all her head feathers out, attempting to drown her... i dont think this is just mating. She does lay, but this has gotten out of hand!!! She wont even stay in the pack anymore. What to do?!?!