Deforestation and the pet trade produce orphaned orangutans who may be taken to rehabilitation centers. Orangutan rehabilitation involves removal of the mother, group-rearing, food provisioning, and exposure to humans. This provides an ecological and social environment drastical…
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Forest fires, poaching, and deforestation are among the key causes of the rapidly dwindling orangutan population in Indonesia. As orangutans become increasingly endangered, primatologists and environmental non-governmental organizations (ENGOs) have worked to protect orangutans …
Laughter is a physiological process and a fundamentally social phenomenon with physical, biological, psychological, philosophical and social dimensions. Laughter is ubiquitous among human populations but its evolutionary history has not been thoroughly examined. Although laugh-l…
This study investigated the signal content and function of adult male long calls in wild orangutans (Pongo pygmaeus). In addition to using existing long term comparative data, orangutans were studied for a combined 18 months at several field sites throughout Indonesia. Over 3,00…
This research on wild orangutans (Pongo pygmaeus pygmaeus) in Gunung Palung National Park, West Kalimantan, Indonesia, on the island of Borneo, investigated how fluctuations in fruit availability affect orangutan nutritional intake, energetics and ultimately reproductive functio…