WHY are my male ducks fighting and attacking me?

Hi all ,I have two male ducks and they fight quite a bit nothing to nasty it only happens when they are on the pond but can rarely happen on the ground, they tend to head bob at each another then go in to fight. They show a lot of behaviour that would come across as showing of to females however we don't own any? But the main problem is the main duck who appears to me to be the dominant one has started to attack me by chasing me away and he bites me but the other one has started to join in.But they only bite me and run after me never anyone else, not any of our visitors or any of the other people in my household who look after them. I was wondering why do they just attack me and if I bought two females would this improve the whole situation? Would they stop attacking me?


Thanks in advance