I currently have a nice flock of hens and would like to add a few ducks-primarily just for fun- not meat or eggs. Can they co-habitat with my hens? Will they walk up the ramp into the house? Are food requirements close enough that ducks can eat the chicken feed considering they free range all day? Do they have to have water- and if I don't give them a kiddie pool will they swim in my stock drinking tanks and make a mess of the drinking water? Will they stay out of the drinking tanks if I give them a kiddy pool? Thanks!