The penultimate instalment investigates the primates, whose defining characteristics are forward-facing eyes for judging distance, and gripping hands with which to grasp branches, manipulate food and groom one another. The programme begins in Madagascar, home to the lemurs, of which there are some 20 different types. Two examples are the sifaka, which is a specialised jumper, and the indri, which has a well developed voice. Away from Madagascar, the only lemur relatives to have survived are nocturnal, such as the bushbaby, the potto and the loris. The others were supplanted by the monkeys and a primitive species that still exists is the smallest, the marmoset. However, Attenborough selects the squirrel monkey as being typical of the group. Howler monkeys demonstrate why they are so named — their chorus is said to the loudest of any mammal — and their prehensile tails illustrate their agility. However, such tails are not characteristic of monkeys that inhabit Africa and many of them, such as vervets and baboons, are just as happy on the ground. Others have moved elsewhere, and the macaques of Koshima in Japan have learned to wash their food before eating. Most apes have taken to swinging from trees, and their feet are just as versatile as their hands. They include the orangutan, the gibbon, the chimpanzee and the primate with whom Attenborough has arguably his most famous encounter, the mountain gorilla.
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