I have 3 pekin ducks (2 females and 1 male) and recently adopted and unwanted male from a neighbor. He's bigger than the others but they have all been picking on him since they were first introduced. Nothing too serious from what I can tell- mostly chasing him around and biting his tail feathers, and some 'mounting' like activity where they put their necks over his back. I'm hoping this is just part of the pecking order being established, but if it goes on too long I want to find a better home for him. He's sweet as can be and quickly learned that I will protect him so he's become my best buddy. Should this behavior subside once everyone is used to eachother?