Harris, Tim Chimpanzees - London, Wayland, 2014 - 32 pages colored pictures - Animal Families . Chimpanzees are humans' closest relatives, and the most intelligent. Baby chimps love to play, they learn quickly by watching grown-ups and older brothers and sisters. When they reach the age of five or six, the males run around in rowdy gangs ISBN: 9780750284509 Dewey Class. No.: 600 / HAR