San Antonio has a problem. Grackles, sort of souped blackbirds, have taken over trees in a downtown area and their droppings are causing quite a problem. Enter Ace and Joker, hawks that are indigenous to Texas, who fly directly at the roosting birds and drop a not to subtle hint: Move along or else. Check out the video here.
Joker, or is it Ace, and his handler. After about three goes, the infesting birds get the hint, and move along to a safer tree, outside the city.
If you have a bird problem in your parking lot you might consider Blackjack Bird Abatement in Houston.