Research on non‐human primates in the endangered tropical dry forest of Sector Santa
Rosa (SSR), Área de Conservación Guanacaste (ACG), was launched in 1983 and is now …

The Primate Origins of Human Nature (Volume 3 in The Foundations of Human Biology
series) blends several elements from evolutionary biology as applied to primate behavioral …

Traditional neo-Darwinism ascribes geographical variation in morphology or in behaviour to
varying selection on local genotypes. However, mobile and long-lived organisms cannot …

Although self-medication in non-human animals is often difficult to document systematically
due to the difficulty of predicting its occurrence, there is widespread evidence of such …

Dispersal has been suggested to be challenging, especially for species that heavily rely on
social learning for knowledge acquisition. One of the obstacles that migrants face is learning …

The spatial and temporal variation in food abundance has strong effects on wildlife feeding
and nutrition. This variation is exemplified by the peatland forests of Central Kalimantan …

The evolutionary origins of speech remain obscure. Recently, it was proposed that speech
derived from monkey facial signals which exhibit a speech-like rhythm of∼ 5 open-close lip …

Orangutans (genus Pongo) are the largest arboreal mammals, but Bornean orangutans (P.
pygmaeus spp.) also spend time on the ground. Here, we investigate ground use among …

Female orangutans exhibit natal philopatry, living in stable home ranges that overlap with
those of their maternal relatives. Using data collected from 2003 to 2017 at Tuanan in …

Pronounced temporal and spatial variation in the availability of food resources can produce
energetic deficits in organisms. Fruit-dependent Bornean orangutans face extreme variation …