Side View of Skeleton of South American Spider Monkey

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“In the other forms the number (vertebrae) varies between twenty and thirty three, the latter being spider monkeys. The proportion in the spider monkeys of the genus Ateles, almost three to one; in the other longest—tailed genera it is rarely so large as two to one.” —Encyclopaedia Britannica, 1910


Encyclopaedia Britannica (11th ed., vol. 22) (New York, NY: The Encyclopaedia Britannica Company, 1910)


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