I am planning to get a few ducks to live in my garden for pest control, but also to raise as pets. I had a pekin duck growing up, and absolutely loved her, so I'd like to get another pekin. I was also thinking of getting rouen and cayuga ducks because I've read they are very sweet and great with pest control. My question is - is it ok to get one of each duck, or should I try to get a male and female of each? Thanks so much for your help!