Mama the chimp and Professor Jan van Hooff first met in 1972 and formed a deep bond Kelli Bender is the Pets Editor at PEOPLE. She has been working at PEOPLE since 2013. Her work has previously ...

"However, if baby Gua grew up to be more human than chimp, then environment wins ... overpower her 'brother,' as she grew in age and strength. Following this, Gua was banished to a "barren ...