Siri, left, a one-year-old chimpanzee hitches a ride with one of the adults in her adopted family, at the Oklahoma City Zoo in Oklahoma City, Wednesday, Sept. 7, 2011. Siri was born at the Sunset Zoo, in Manhattan, Kansas, to an adult who was too old to nurse. Her biological mother is 57 years of age and the oldest mom to give birth in history per Chimpanzee Species Survival Plan (SSP) Coordinator Steve Ross, Lincoln Park Zoo. Siri has been at the Oklahoma City Zoo since April. (AP Photo/Sue Ogrocki)