I have a 2 week old mallard drake. In the summer, I'd like to try to get him a female to have as a companion. Can I give him just one? I don't have room for more than 2 ducks where I live. Also since he is a mallard would any breed of duck be okay as a mate? I was thinking about an Indian Runner duck. It says online they weigh 3 1/2 pounds. He should weigh 2 1/2 pounds as an adult. Would they be compatible?