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Geographic distribution of the four gibbon genera. The Mekong River divides the Nomascus and mainland Hylobates groups. The Hoolock and mainland Hylobates groups are divided by the Salween River. Sympatry exists between Symphalangus and some members of the Hylobates group with conspecific breeding likely avoided due to significant size differences between these taxa. Map after Geissmann (1995) (http://www.gibbons.de/main/system/system.html).
