Richard, I think it is unreasonable to build an area of great wildlife habitat and not expect different forms of wildlife to use it. That's like having a pasture and not expecting any deer to go there because they might compete for some forage. This just isn't the real world.
About the only way that I know of to avoid this is to have a swimming pool and manicured yard.
What we can do is modify our pond environment so that it discourages the wildlife we don't want. Canada geese are a good expample. They can be a horrendous problem. But they hate tall vegetation because they can't see predators. I can't get rid of all the deer on our property but I can and do invite lots of people over to kill all of the does they legally can get.
