This one has a different twist to it. I was leading a group of birding friends around South Padre Island, TX a few years back and visited a small patch of willows on a vacant lot (a very popular birding spot on the Isle that many of you my be familiar with). We wandered into the trees and were suddenly upon a photo blind containing a photographer (a good pro). He proceded to become upset with us as we were "too close" to him, and he was right, we were too close (10 yards) for the birds to visit his drip. As a photographer, I agreed with him and promptly retreated. But, as birders, my friends and I didn't think that the pro photographer really had the right to dominate one of the very best spots on the little island to see migrants. We had traveled a long ways to bird in South Texas and felt shorted that we couldn't bird at that spot (out of respect for this pro, whom was a very nice person also!). As a photographer (not a pro), I wouldn't expect to be able to set up and "own" a spot like that. My 2 cents.