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1 Catarrhines and Platyrrhines 2 Tail of the Spider Monkey 3 Chimp showing opposing thumbs 4 Crowned lemur 5 Hamadryas baboons 6 White-handed gibbon 7 Male bonobo and a younger female 8 Gorilla killed by poachers 9 Photo of chimps of 9
Chimp showing opposing thumbs on hands and feet. Kenneth Garrett/ National Geographic Society
