1. Life History: The Energy-Efficient Orangutan
Anne E. Russon 
Current Biology 
Volume 20, Issue 22, Pages R981-R983 (November 2010)
DOI: /j.cub
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2. Figure 1 The slow orangutan.
Tulp's famous ape [19] shows the lassitude and morose, melancholic attitude that are among the signs that it is an orangutan (not a chimpanzee, as many have thought).
Current Biology  , R981-R983DOI: ( /j.cub )
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