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Recently discovered, the oldest human abstract drawing is around 73,000years. Although the origins of drawing behaviour have remained an enigma tothis day, light may be shone on the subject through its study among our closestneighbours, the great apes. This study analyses 749 drawings of five femaleBornean orang-utans (Pongo pygmaeus) at Tama Zoological Park in Japan. Wesearched for differences between individuals but also tried to identifypossible temporal changes among the drawings of one individual, Molly, who drewalmost 1,300 drawings from 2006 to 2016. A classical analysis of the drawingswas carried out after collecting quantitative and qualitative variables. Ourfindings reveal evidence of differences in the drawing style of the fiveindividuals as well as creative changes in Molly's drawing style throughout herlifetime. Individuals differed in terms of the colours used, the space theyfilled but also the shapes (fan patterns, circles or loops) they drew. Mollydrew less and less as she grew older, and we found a significant differencebetween drawings produced in winter, when orang-utans were kept inside and hadless activity, and those produced during other seasons. Our results suggestthat the drawing behaviour of these five orangutans is not random and thatdifferences among individuals might reflect differences of styles, states ofmind but also motivation to draw. These novel results are a significantcontribution to our understanding of how drawing behaviour evolved in hominids.

I wanna draw like you: Inter-and intra-individual differences in orang-utan drawings