Workers and visitors at the San Francisco Zoo are mourning a 48-year-old gorilla named Pogo. Zoo officials said she was the “auntie” of the gorilla group.
Pogo was a female Western lowland gorilla. She died sometime Tuesday night in her sleep.
Gorilla keeper Mary Kerr discovered Pogo Wednesday morning.
Zoo officials said Pogo is believed to have been one of the oldest living gorillas in captivity.
Pogo's level of activity had been declining for some time, according to zoo officials.
A necropsy is being conducted. Results have not been made available.