An 11-year-old endangered, western lowland gorilla named Patty has arrived at the Philadelphia Zoo.PHILADLEPHIA (WPVI) -- The Philadelphia Zoo is adding to its primate family.An 11-year-old endangered, western lowland gorilla named "Patty" has arrived. An 11-year-old endangered, western lowland gorilla named Patty has arrived at the Philadelphia Zoo.Patty came to the zoo as part of a breeding program.Guests can now visit her at the PECO Primate Reserve. Report a correction or typo