POWER AND SYRED / SCIENCE PHOTO LIBRARY POWER AND SYRED / SCIENCE PHOTO LIBRARY
Colombian black-faced spider monkeys (Ateles fusciceps robustus). These primates live in the mature rainforests of Colombia. They have long arms and legs and a prehensile tail that acts like a fifth limb making them exceptionally agile. The tail has a hairless patch on the tip that's used for grip. They live in groups of varying sizes - from 4 or 5 to over 100 - depending on the time of year and the amount of food available. Spider monkeys have no thumbs as they are unnecessary for swinging through trees.
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