Because everything which can exist on the Internet, must exist on the Internet…I give you the Pigeon Movie Database.
Actually that’s a big of a misnomer, there are also entries relating to some TV shows and advertisements. Like this one about an “other-worldly pigeon” in Battlestar Galactica.
I recommend that everyone send King Pigeon Jr a message every time you see a pigeon in a movie. It would be a shame if he missed any.