Perhaps we need a new place to walk?

Isaac and I have been taking the same route every day on our fabulous little walk -- first we walk up the main street to the 7-11, then we walk down into the park and back to the apartment complex along a less-crowded street. Now, I may have been creeping into the paranoia that inevitably comes when Dad has left the building for X number of hours (Ladies, you know what I'm talking about -- when his guitar case, out of the corner of your eye, looks like an axe murderer casually leaning against the wall in your house), but today I noticed a disturbing pattern under some pine trees. Evidently there is a nest for medium-sized birds (pigeons?) in this grove of pine trees. Each of the past three days, Isaac and I have noticed a new bird carcass laying on the ground. Weirder still is that these carcasses are ONLY bird wings, and the poor birds' bodies are completely gone except for their skeletons. It is FREAKY-DEEKY. Is there some kind of predatory creature that would do this, or do I live in an Alfred Hitchcock movie?