From AP News:
"LOS ANGELES -- Hollywood residents believe they've found a humane way to reduce their pigeon population and the messes the birds make: the pill.

Over the next few months a birth control product called OvoControl P, which interferes with egg development, will be placed in bird food in new rooftop feeders.

"We think we've got a good solution to a bad situation," said Laura Dodson, president of the Argyle Civic Association, the group leading the effort to try the new contraceptive." Continue reading Hollywood Poop

I guess Hollywood has a shortage of pigeon hawks.