I Wanna Draw Like You: Inter- and Intra-Individual Differences in Orang-Utan Drawings.

This study analyses 749 drawings by five female Bornean orang-utans () at Tama Zoological Park in Japan. We searched for differences between individuals but also tried to identify possible temporal changes among the drawings of one individual, Molly, who drew almost 1300 drawings from 2006 to 2011. An analysis of the drawings was carried out after collecting quantitative and qualitative variables.