At our sailing club, ducks (and/or geese) tend to adopt one boat, or a couple- always the furthest out at the edge of the mooring field- as their home/toilet. Certain boats have needed a major cleaning before every time they are sailed. I've seen boats completely covered in duck poop. It's disgusting and disheartening. Owners have tried everything- hanging CD's or other shiny stuff, plastic owls, wrapping the boat in snow fencing, etc, to little or no avail. I don't know if plastic snakes have been tried, but it seems that birds don't take long to figure out what is alive and what is a decoy. Not a problem for me personally, since the shallow draft of the SunCat puts us in the inner, shallow part of the mooring field (thank you, ComPac)....it's the keel boats like Ensigns that get trashed, as they are assigned to the outer (deeper) parts of the field. The idea under consideration for next season is to moor a derelict boat or two at the outer edge of the field as a sacrificial platform for the ducks, in the hope they will leave the rest of the boats alone. We'll see if that helps and I'll suggest the snakes, too.