Surely you jest...According to my book there are 413 species native to Ohio and since last October I have photo documented 93 species in my yard. Since I retired and spend 5 to 10 hours a day shooting pictures my birds spend so much time in front of the camera that they all think their fashion models, Pray tell ,,how do i pick three?? Do I pick the Hummingbird that landed on my knee and sat their 5 minutes or the Chickadee who eats from my hand? Perhaps its the Bluejay who lands on my window sill and pecks on the glass to tell me the bird feeder is empty for the second time today. But then, how could I ignore the Male & Female cardinals that brought their three babies down to eat seed on the driveway 10 feet from my perch on the back steps? For as much as most people despise the Starlings, I can't help but admire the one in my yard that chases the neighbors cat away. In fact, i can't even name three that I don't like although I am a bit upset with the wild turkeys who ate all the garlic plants in my garden.

I would check out the calls on these two species: http://www.allaboutbirds.org/guide/Whip-poor-will/id http://www.allaboutbirds.org/guide/Chuck-wills-widow/id (although these are slightly out of the range of VT)

I use two packages of lard, which I melt down in a large pot on the stove. Once that is melted the heat is shut off, and I add two cups of chunky peanut butter, and stir until melted. Then I add two cups of shelled sunflower seeds which have been ground up in my food processor. Then I add four cups of corn meal, a tablespoon of bone meal, one third of a cup of sugar, and as much flour as needed to get it to the right consistency. I pour some into pans to cool and cut into pieces so they will fit the suet feeder. Some goes into covered containers to be crumbled into the Bluebird's feeder dish. Below is a picture of the suet cage I now use. The squirrels and chipmunks would take all of it if I didn't cage in my suet holder. The birds go right in through the wire (1 1/2 inch), but the squirrels cannot access it. There is a clip on the left side that I use to open and close the cage surrounding the suet holder.

I'm glad your bird problem turned out to be seasonal but just in case you ever face this problem again (or any bird infestation problem) I thought it might be helpful to just mention a different angle on this. The problem is not that the birds are pooping (or whatever they're doing) in your pool. That is simply a symptom of your real problem: that your environment is attractive to birds. If you really want to keep birds from being destructive to your property you have to make it so that your land is a place they don't want to hang out on in the first place. There are a lot of different approaches to this but yes, stopping the food supply is one of them. Another would be the mylar balloons someone else mentioned up above. There are also specialized bird scare balloons with 'eyes' that follow the birds wherever they fly as well as holographic tape. These incorporate movement so they are usually more affective than static decoys. There are other senses to attack as well: taste/smell, touch, and hearing. Birds hate methyl anthranilate (a chemical derived from concord grapes that has long been used for grape flavoring)--it gives them a similar sensation to what we feel when we encounter bleach. This comes in commercially available sprays. Also, there are sticky gels, netting, or spike strips that keep birds from roosting on certain surfaces. Lastly, there are sound devices that utilize recordings of predators/distress calls that scare birds away. For a partially or fully enclosed area you could use an ultrasonic device as well (one that can't be heard by humans but is annoying to birds and bats). Make sure that you switch up whatever you use from time to time. If you use balloons, move the location (but always keep it near where the birds are nesting). If you're using a sound device change the interval between effects, try to randomize the effects being used. Also, using the products together in a synergistic way will create a more effective and longer-lasting reaction. I'm glad to hear that no one has mentioned killing or injuring the birds...don't do that. As mentioned before that would be reacting to the symptoms rather than truly solving the problem. Furthermore, it would be very easy to accidentally tamper with one of the MANY birds protected by the Migratory Bird Act of 1918 (and then you'd be in big trouble). Just a side note: be careful when cleaning up the bird poop. Birds can transmit over 60 diseases to humans. Some of them are fatal. Bird dropping particles can be unknowingly inhaled and lead to serious health problems. Good luck in your future bird encounters! Here is a link that might be useful: click for examples, case studies and FAQs about bird pest control