When you have an unwelcome group of visitors causing problems it helps to have a big intimidating someone to come and break it all up. That's why bars and clubs have bouncers. 

One BART station up in the Bay Area is having problems so it hired a new security guard. It's a hawk named Pac-Man that is there to scare off problematic pigeons. Ricky Ortiz is a falconer with Falcon Force and Pac-Man's handler.