i have a problem --i have 4 ducks --2 brown 2 white m/f brown and m/f white -----well the first night my white female duck got ate by something so i went to get another female white duck ---at first they didnt want her around but she stay with it until they did and everything has been find --- until now the male white duck is chasing the other white duck will not let her swim with them and i am about ready to get him what is his problem and why is he acting like this ?