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[[File:Video wild orangutan Borneo.webm|thumb|alt= Video of a wild orangutan in Malaysia|Wild orangutan in the Danum Valley ([[Sabah]], Malaysia, Borneo island)]]
Orangutans are mainly [[Arboreal locomotion|arboreal]] and inhabit [[tropical rainforest]], particularly lowland [[Dipterocarpaceae|dipterocarp]] and old [[secondary forest]].<ref name="MacDonald"/><ref name="international1" /> Populations are more concentrated near riverside habitats, such as [[Freshwater swamp forest|freshwater]] and [[peat swamp forest]], while drier forests away from the flooded areas have
Most of the day is spent feeding, resting, and travelling.<ref>{{cite book|author=Rodman, P. S.|year=1988|contribution=Diversity and consistency in ecology and behavior|editor=Schwartz, J. H.|title=Orang-utan biology|pages=31–51|publisher=Oxford University Press | isbn=978-0195043716}}</ref> They start the day feeding for two to three hours in the morning. They rest during midday, then travel in the late afternoon. When evening arrives, they prepare their nests for the night.<ref name="international1" /> Potential predators of orangutans include [[Sumatran tiger|tiger]]s, [[Sunda clouded leopard|clouded leopards]] and [[dhole|wild dogs]].<ref name="RijksenMeijaard1999"/>{{rp|91}} The most common orangutan parasites are [[nematode]]s of the genus ''[[Strongyloides]]'' and the [[ciliate]] ''[[Balantidium coli]]''. Among ''Strongyloides'', the species ''S. fuelleborni'' and ''S. stercoralis'' are reported in young individuals.<ref>{{cite book|author1=Foitová, Ivona |author2=Huffman, Michael A.|author3=Wisnu, Nurcahyo|author4=Olšanský, Milan|contribution=Parasites and their impacts on orangutan health|editor1-first=Serge A. |editor1-last=Wich |editor2-first=S. Suci Utami |editor2-last=Atmoko |editor3-first=Tatang Mitra |editor3-last=Setia |editor4-last=van Schaik|editor4-first=Carel P. |title=Orangutans: Geographic Variation in Behavioral Ecology and Conservation |year=2009 |url=https://archive.org/details/orangutansgeogra00wich |url-access=registration |publisher=Oxford University Press|page=[https://archive.org/details/orangutansgeogra00wich/page/n198 166]|isbn=978-0199213276}}</ref> Orangutans also use the plant species ''[[Dracaena (plant)|Dracaena cantleyi]]'' as an anti-inflammatory balm.<ref>{{cite journal |vauthors=Morrogh-Bernard HC, Foitová I, Yeen Z, Wilkin P, de Martin R, Rárová L, Doležal K, Nurcahyo W, Olšanský M |year=2017|title=Self-medication by orang-utans (''Pongo pygmaeus'') using bioactive properties of ''Dracaena cantleyi'' |journal=Scientific Reports |volume=7 |issue=16653 |page=16653|doi= 10.1038/s41598-017-16621-w|pmid=29192145|pmc=5709421|bibcode=2017NatSR...716653M|doi-access=free }}</ref> Captive animals may suffer an upper respiratory tract disease.<ref>{{cite journal|last1=Zimmermann|first1=N|last2=Pirovino|first2=M|last3=Zingg|first3=R|last4=Clauss|first4=M|last5=Kaup|first5=F. J.|last6=Heistermann|first6=M|last7=Hatt|first7=J. M.|last8=Steinmetz|first8=H. W.|year=2011|title=Upper respiratory tract disease in captive orangutans (Pongo sp.): prevalence in 20 European zoos and predisposing factors|journal=Journal of Medical Primotology|volume=40|issue=6|pages=365–375|doi=10.1111/j.1600-0684.2011.00490.x|pmid=21770970|s2cid=997385}}</ref>
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