Dr George McGavin looks at the world of primates. He meets an orangutan who uses soap to improve her personal hygiene and heads underground to a monkey dormitory.

Our primate family is incredibly varied and surprising. From the ninja tarsier, a spring-loaded ambush predator the size of a tennis ball, to the magnificent herds of geladas in the mountains of Ethiopia, primates have adapted to environments across the planet.

In this episode, Dr George McGavin gets up close and personal with Siswi, an orangutan who uses soap to improve her personal hygiene. He strips off to experience the mind-numbing cold of the Japanese Alps and heads 100 metres underground to a secluded monkey dormitory.

Then there are baboons with a thirst for flamingo flesh, macaques with criminal minds, fluorescent mandrills who wear war paint to do battle, and Ardry, a real-life gremlin who sees the unseeable with her extraterrestrial fingers.