Life History: The Energy-Efficient Orangutan Anne E. Russon  Current Biology  Volume 20, Issue 22, Pages R981-R983 (November 2010) DOI: 10.1016/j.cub.2010.10.003 Copyright © 2010 Elsevier Ltd Terms and Conditions

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 2010 20, R981-R983DOI: (10.1016/j.cub.2010.10.003) Copyright © 2010 Elsevier Ltd Terms and Conditions