The jury may be out on whether you want to have starlings around, but the verdict is pretty clear as to their role in altering certain historial balances. Like English sparrows, starlings are non-native, non-migratory birds which aggressive and territorial toward other birds and, as a result of these traits, highly-capable reproducers. If you are interested in any kind of habitat for, especially, purple martins or bluebirds, then sparrows and starlings are extremely detrimental--sparrows will take over existing nests and push out eggs, and starlings will physically attack nesting martins. In fact, Congress banned the importation of English sparrows and starlings into the United States in 1960; they are categorized the same as zebra mussels. Although I don't make quit as much a campaign of it as Congress did, I do use a Beeman air gun without hesitation if either one is getting in the way of other species.