Hmmm. I was just about to post on my LJ a quandary I am having about starlings. I put seed out on my patio to attract birds. The only ones that show up are house sparrows and starlings. My cats and I enjoy watching these birds - regardless of their status as invasive. I wonder though if I am doing environmental harm by feeding these birds (keeping them fit) or if this is an environmental "good" by reducing the competition for scarce resources with native birds if the invasives are happy enough to feed from my patio. Also, there is the consideration of buying wild bird seed when most of it contains sunflower seeds. The sunflower industry in the United States poisons millions of red-wing black birds (and other non-target native species) each year to protect their crops.