On May 24, 2006 (April 27, 2006 in the lunar calendar), Pargo, the world's oldest human-fed gorilla, passed away. On May 24, 2006, the San Francisco Zoo in the United States announced that Pago, the world's oldest artificially fed gorilla, passed away on the 24th. Pago was born in Cameroon. After his parents were killed, he was adopted by American missionaries and a nurse. He was donated to the San Francisco Zoo when he was 3 years old. Paco had no children, but raised another chimpanzee as an aunt. The 210-pound primate suffered from arthritis, heart disease and other diseases. It was found dead peacefully in its bedroom on the 24th. Four other gorillas who lived with it guarded it. Its favorite orangutan shaped toy lies not far from it. Pargo was very popular among tourists during his lifetime, and people gave it many gifts including magazines, calendars, and televisions. Its remains will be donated to the University of California for anthropological research. Gorillas can live for about 35 years in the wild and more than 50 years in artificial feeding. Massa of the Philadelphia Zoo lived to 54 years old, and Rudy of the Erie Zoo in Pennsylvania lived to 49 years old, both younger than Pargo.