Orangutan populations living on opposite sides of a large river differed in 60% of their dietary preferences, despite greater dietary homogeneity within each population.
Sources
- The pervasive role of social learning in primate lifetime development (pmc.ncbi.nlm.nih.gov)
- https://onlinelibrary.wiley.com/doi/10.1002/ajpa.21304 (onlinelibrary.wiley.com)
- https://www.researchgate.net/publication/46307665_Diet_Traditions_in_Wild_Orangutans (researchgate.net)
- https://news.mongabay.com/2017/05/preserving-orangutan-culture-an-ingredient-for-successful-conservation/ (news.mongabay.com)