| the behavioural contexts of red langur (presbytis rubicunda) loud calls in the wehea forest, east kalimantan, indonesia. | researchers hypothesize that male loud calls play several roles in primate societies including in the context of intergroup spacing and spatial coordination. field studies examining the behavioural correlates of vocalizations are essential to evaluate the function of these calls. this preliminary study, from july 2011 to january 2012, explores the behavioural contexts and correlates of male loud calls in a habituated group of red langurs (presbytis rubicunda) in the wehea forest, east kalimantan ... | 2016 | 26938053 |
| terrestriality in the bornean orangutan (pongo pygmaeus morio) and implications for their ecology and conservation. | aside from anecdotal evidence, terrestriality in orangutans (pongo spp.) has not been quantified or subject to careful study and important questions remain about the extent and contexts of terrestrial behavior. understanding the factors that influence orangutan terrestriality also has significant implications for their conservation. here we report on a camera trapping study of terrestrial behavior in the northeastern bornean orangutan, pongo pygmaeus morio, in wehea forest, east kalimantan, indo ... | 2013 | 23784888 |