In an effort to document some of these emotions, photographer Anne Berry has spent several years travelling to small zoos from Germany to South Africa to capture intimate portraits of primates living in captivity.
Each zoo has its own 'monkey hut' that houses the primates. In addition to the monkey hut, there is usually a large outdoor habitat where primates are free to go.
Baboons are some of the largest primates that don't belong to the great ape family. They live in 'troops' that vary in size from five to 250 animals.
Macaques live in many different habitats and are frequently used in medical research, including AIDS research. Berry believes they have some of the most expressive faces.
The Javan lutung also communicates through visual cues, touch, and 'alarm calls.' This type of primate is relatively small.
Members of the Great Apes family experience great empathy and bonds of attachment to their families. Chimpanzees can understand the emotions in events shown on video.
In each of the photos, Berry is usually the only person at the zoo. The primates, like this baboon, interact directly with her.
Berry has worked with primates both in the wild and in captivity. She says that, surprisingly, she hasn't noticed any difference in how they act in each situation.
While the primates may sometimes be constricted by the size of their habitat, Berry says that the zoos have become experts at providing exactly what the animals need.
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