I have 3 ducks, all around 2 - 3 months old. I am unsure of the breed (possibly muscovy). I hatched them. The youngest ( name is bug ) started trying to bite me a few weeks ago and hasn't stopped since but is not as aggressive towards the other two and as of a few days ago Umi the second youngest has been ripping out the oldest chest feathers all day and night randomly.The eldest Pip (they are all a week apart in age) is not the slightest bit aggressive. I feel so guilty and sad about pip getting picked on, I am unsure if the aggression could be a health issue, diet, sex ect.. and ideas are more then welcome. Thankyou