The oldest male chimpanzee in the U.S. died Saturday (June 5th) at age 63 at the San Francisco Zoo & Gardens.Cobbywas brought to the zoo in the 1960s after having been a head-reared performing chimpanzee. Tanya M. Peterson, executive director of the San Francisco Zoological Society, said, "Cobby was part of San Francisco. He touched so many lives, and people have so many memories of him. He is irreplaceable, and our hearts are broken." The average life expectancy of a chimp in the wild is 33 years, and it's between 50 and 60 years for those under human care, according to the zoo.