Importance of studying non-human primate anatomy, physiology and behavioral ecology

What is the importance of studying non-human primate anatomy, physiology and behavioral ecology?
What methods have been used to study primate behavior, and what are some of the challenges involved in doing -ethnography of monkeys and apes?
What could be the relevance of those studies, if any, to understand hominid evolution and anatomically modem humans? In your response, be sure to rely, at least in part. on the readings by Strier (2003), Wundram (1979).

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