Scott, A. M.; Knott, C. D.; Susanto, T. W. (2019). "Are Male Orangutans a Threat to Infants? Evidence of Mother–Offspring Counterstrategies to Infanticide in Bornean Orangutans ( Pongo pygmaeus wurmbii)". International Journal of Primatology. 44 (3): 435–55. doi: 10.1007/s10764-019-00097-8. hdl: 2144/39274. S2CID 198190605. van Schaik, Carel P.; Damerius, L.; Isler, K. (2013). "Wild Orangutan Males Plan and Communicate Their Travel Direction One Day in Advance". PLoS One. 8 (9): e74896. Bibcode: 2013PLoSO...874896V. doi: 10.1371/journal.pone.0074896. PMC 3770631. PMID 24040357. a b Lameira, A. R.; Hardus, M. E.; Shumaker, R. W.; Wich, S. A.; Menken, S. B. J. (2015). "Speech-Like Rhythm in a Voiced and Voiceless Orangutan Call". PLOS ONE. 10 (1): e116136. Bibcode: 2015PLoSO..10k6136L. doi: 10.1371/journal.pone.0116136. PMC 4287529. PMID 25569211.

Groves, C. P. (2005). Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rded.). Baltimore: Johns Hopkins University Press. pp.183–84. ISBN 0-801-88221-4. OCLC 62265494.

GIFs

Wrangham, Richard W; Peterson, Dale (1996). Demonic Males: Apes and the Origins of Human Violence. Houghton Mifflin. p. 137. ISBN 978-0-395-69001-7. a b c Singh, Ranjeet (26 January 2011). "Orang-utans join the genome gang". Nature. doi: 10.1038/news.2011.50. Archived from the original on 27 January 2011 . Retrieved 27 January 2011. Orangutans are primarily fruit-eaters, which can take up 57–80% of their foraging time. Even during times of scarcity, fruit is 16% of their feeding time. Fruits with soft pulp, arils or seed-walls are consumed the most, particularly figs but also drupes and berries. [23] :65 Orangutans are thought to be the sole fruit disperser for some plant species including the vine species Strychnos ignatii which contains the toxic alkaloid strychnine. [49] On October 28th, YouTuber [12] 0CEAN M4N uploaded a video titled "where banana" consisting of a slow zoom over the meme and an original song, garnering over 30,000 views in four months (shown below).

Groves, Colin P. (2002). "A history of gorilla taxonomy" (PDF). In Taylor, Andrea B.; Goldsmith, Michele L. (eds.). Gorilla Biology: A Multidisciplinary Perspective. Cambridge University Press. pp.15–34. doi: 10.1017/CBO9780511542558.004. ISBN 978-0521792813. Archived from the original (PDF) on 26 March 2009. a b van Wyhe, John; Kjærgaard, Peter C. (1 June 2015). "Going the whole orang: Darwin, Wallace and the natural history of orangutans". Studies in History and Philosophy of Science Part C: Studies in History and Philosophy of Biological and Biomedical Sciences. 51: 53–63. doi: 10.1016/j.shpsc.2015.02.006. ISSN 1369-8486. PMID 25861859. Butler, R. A. (20 August 2009). "Rehabilitation not enough to solve orangutan crisis in Indonesia". Mongabay. Archived from the original on 5 January 2012 . Retrieved 26 March 2012. Lucy is an adult female hybrid orangutan. The oldest of the Zoo’s orangutans, Lucy often delights visitors by sitting up at the glass. She is the only orangutan that chooses not to travel the O-Line. Lucy was born at the Zoo in 1973.On February 24th, 2021, Redditor /u/Wannabedankestmemer posted an image macro to /r/dankmemes [9] in which they change "banana" to "6.4GB" garnering over 26,600 upvotes in eight days (shown below). a b c d e f Rijksen H. D.; Meijaard, E. (1999). Our vanishing relative: the status of wild orang-utans at the close of the twentieth century. Springer. ISBN 978-0792357551. Batang is an adult female Bornean orangutan. She has pale skin on her face, especially around her eyes and mouth, and is smaller in stature than the Zoo’s other female orangutans. Batang tends to be very social; she enjoys spending a few days with some of the orangutans, then switches groups, spending a few days with the other orangutans. Batang was born in December 1996 at the Lincoln Park Zoo and came to the Smithsonian’s National Zoo in 2004 as part of the Bornean Orangutan Species Survival Plan (SSP). Orangutans build nests specialised for either day or night use. These are carefully constructed; young orangutans learn from observing their mother's nest-building behaviour. In fact, nest-building allows young orangutans to become less dependent on their mother. From six months of age onwards, orangutans practise nest-building and gain proficiency by the time they are three years old. [71] Oishi, M.; Ogihara, N.; Endo, H.; Ichihara, N.; Asari, M. (2009). "Dimensions of forelimb muscles in orangutans and chimpanzees". Journal of Anatomy. 215 (4): 373–82. doi: 10.1111/j.1469-7580.2009.01125.x. PMC 2766055. PMID 19619166.