Beirut, Lebanon (CNN) -- "Grooming is a social thing, a friendly thing, it calms chimpanzees down," says Jason Mier director of animal rights NGO Animals Lebanon.
As Mier talks, Omega, a 12 year old chimpanzee, picks through Mier's hair, occasionally yanking out the offending strand. It's one of the few displays of natural behavior that Omega has shown in over a decade.
Omega used to serve customers at a cafe in southern Lebanon until some got him drunk. As a result he turned aggressive, attacked some clients and was sold to a small, decrepit zoo.