Current Biology
Volume 20, Issue 22, 23 November 2010, Pages R981-R983
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Life History: The Energy-Efficient Orangutan

https://doi.org/10.1016/j.cub.2010.10.003Get rights and content
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Summary

A study of orangutans' daily energy expenditure confirmed exceptionally slow metabolism. It suggests they evolved a lifestyle designed to minimize energy use. If so, shifting to a higher energy-use strategy may help explain how humans evolved.

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