A willingness to mate is a relatively straightforward message.But primates are capable of much more complex communication.It starts between a mother and her baby.The rainforests of Sumatra.This female orang-utan is forty-two years old.Her third child, a six year old daughter,is still with her.Orangs look after their children for longer than any other primate...except ourselves.It will take her nine years to teach her youngstereverything she needs to know about this complex tree-top world.She must learn how to collect ants and termites.How to identify at least 200 kinds of edible plants...
