An invasive species of parasite infesting public spaces at airports. They are ravenous devourers of complimentary beverages and foodstuffs, and will quickly overrun habitats if allowed to establish a colony. Their loud and dissonant vocalizations drive away indigenous pilots and passengers, generally disrupting the fragile ecosystem of the FBO. There are no known means of eradicating an established colony, short of natural expiration.
Like a metastasizing cancer, the airport bums penetrated the lobby in a teeming plague of slack, wrinkley, wasting flesh, devouring the cookies and coffee in a sickening display of pigish rutting.