Probably a little blue heron. In real life they look very dark all over, not the reddish purple in the field guides.

Thanks so much! I've been discouraged about my new camera choice after looking at some early Canon EOS 7D bird photo samples..soft images, over exposed, noisy, EEEeew. I was upset, but DB comforted me by pointing out that the first poster had used a cheap Sigma lenses and lightened the image, and the second one had used a doubler. Then I found a professional photographer's website with photos taken using a 7D that were exquisite, but he could have been taking the photos from up close and using a pricey lens. The Canon EOS 7D reviews are full of glowing praise, so I don't know what to think. I checked a chatline and the consensus there was that it was the best thing for the price since sliced bread. Everyone had either bought one or was about to, and that once you spend 3 days reading the thick instruction manual and adjusting all the settings, you'll have increasingly better results with practice, and they seemed to all be delighted with it. Well, I have to have some sort of camera improvement; as it is, I've spent alot of time stalking ducks at the fish hatchery-crawling through weeds, lying in the grass to get as close as possible-yet the Canon 40D camera couldn't handle shadows or water well and most of the photos were barely usable even for ID purposes. Photos taken with the 7D-look great until you zoom in. http://forums.dpreview.com/forums/read.asp?forum=1019&message=33518247 Camera discussion group, reviewing their Canon EOS 7D experiences http://photo.net/canon-eos-digital-camera-forum/00V9r0

Oh I sure hope ALL of the redwinged blackbirds come to stay with you for a while. They've been with us for two months, stripping our feeders, hundreds upon hundreds of them blackening our trees and yard. We've gone through soooo much seed and our poor little regular birds don't stand a chance. When all converge, it reminds us of the movie "The Birds". They are so noisey. They loved our beech trees when we lived in Ohio. They will return to us again in the fall.

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