I am interested in adding a few ducks(2 or 3) to my flock of 5 laying hens but i can't decide what breed to get. I was originally thinking runners but i just can't find a place in my area that sells them. I need a duck that is not very aggressive and non-migrating. I'm not necessarily looking for a good layer but a frequent egg would be nice (I would really love ones that aren't so vulnerable to raccoons). Any suggestions?