Abstract
Field sudies of orang-utans, gibbons, and siamangs in Borneo, Sumatra, and Malaya provide evidence to show that, irrespective of species feeding preferences, differences in body size guarantee sufficient ecological separation for different ape species to coexist.
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MacKinnon, J. A comparative ecology of asian apes. Primates 18, 747–772 (1977). https://doi.org/10.1007/BF02382929
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DOI: https://doi.org/10.1007/BF02382929