sexually dimorphic quadrupedal dipterocarp riverine montane sexual dimorphism frugivorous primary forest folivores taxonomical sexual dimorphism quadrupedal sympatry montane craniometric analyses sagittal crest mangrove semideciduous intraspecific savanna bipedal foraging arboreal montane weaning forage infanticide raptors folivore foramen magnum terrestrial anogenital savannas semideciduous forest shifting agriculture arboreal foraging sympatric knuckle walking habituated groups phasmids zoonotic quadrupedally arboreal brachiate alpha status Menarche anogenital montane savannah knuckle-walking pelage infanticide lowland forests frugivores quadrupedal primary bipedally sympatric conspecifics secondary forests morphological quadrupedally opportunistically infanticide pin.primate.wisc.edu sexually dimorphic primary forests tannin pelage Africa's Great Lakes secondary mental maps herbaceous secondary forest submontane bipedalism frugivores riverine savanna parturition quadrupedal morphological hybridization http://pin.primate.wisc.edu/factsheets/glossary brachiation sympatry http://pin.primate.wisc.edu/factsheets/glossary terrestrial knuckle walking pin.primate.wisc.edu mangrove sexually dimorphic Menarche anogenital bipedalism allomothering estrus quadrupedal anogenital parturition interbirth interval Dominance hierarchy interbirth interval consortship prosimians agonistic