I just recently acquired two 8 week old Cayuga/black swedish mix ducks. I'm already in love! I currently have them in my chickens run with a kiddie pool since my chickens free range now. I put them in the coop at night inside a pen so my rooster doesn't bother them. I was wondering, how well do ducks free range? Will they come back to the coop at night like chickens? I also have a creek on my property that isn't fenced acrossed, the rest of my acre is fenced. If the ducks swam in the creek will they swim down it and never come back or do they have pretty good instincts to stay around the coop?