Orangutan populations are certainly not increasing in the wild. Meijaard, E., Sherman, J., Ancrenaz, M., Wich, S. A., Santika, T., & Voigt, M. Current Biology, 28(21):R1241–R1242, 2018.
Orangutan populations are certainly not increasing in the wild [link]Paper  doi  bibtex   
@article{meijaardOrangutanPopulationsAre2018,
	title = {Orangutan populations are certainly not increasing in the wild},
	volume = {28},
	issn = {0960-9822},
	url = {https://doi.org/10.1016/j.cub.2018.09.052},
	doi = {10.1016/j.cub.2018.09.052},
	number = {21},
	urldate = {2018-11-05},
	journal = {Current Biology},
	author = {Meijaard, Erik and Sherman, Julie and Ancrenaz, Marc and Wich, Serge A. and Santika, Truly and Voigt, Maria},
	year = {2018},
	pages = {R1241--R1242},
}

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