I have a small flock of Pekins and Rouens...they have a very nice grass area to roam with nesting spots and a building if I need to close them up for some reason...mostly free range...I seem to have collected a following of wild ducks who come to eat, bathe in the pools and do what ducks do...it started with a pair and has escalated to 12 or 6 pair...I am concerned with bio hazards and if this is potentially dangerous for my ducks...I also have 6 geese in that area...any and all input would be appreciated...oh, the jokers are Black Bellied Whistling Ducks...they are beautiful but I worry about my flock and something being brought in...they sometimes land in the chicken yard as well...any thoughts on this would be greatly appreciated...