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The behaviour and ecology of wild orang-utans (Pongo pygmaeus)

Animal BehaviourPublished 1 February 1974
John Mackinnon
Citations717
SJR quartileQ1
SJR score0.81
SNIP0.91

TL;DR

Comparison between several populations revealed an interesting mechanisms for the natural regulation of animal numbers and differences between Bornean and Sumatran orang-utans are discussed in relation to the zoogeography of these two islands.

Abstract

Between June 1968 and November 1971, 21 months of fieldwork were spent studying wild populations of orang-utans in Borneo and Sumatra. Fifteen hundred hours of daylight observation were made on these animals. In contrast to other higher primates, the dispersed distribution of food and the orang-utan's slow mode of travel seem to favour solitary habits. Over, 80 per cent of foraging units seen contined only one independent animal, either alone or with dependent young. Larger groupings were seen when adolescents joined up with other animals or when males and females formed temporary consortships for mating purposes. Comparison between several populations revealed an interesting mechanisms for the natural regulation of animal numbers. Differences between Bornean and Sumatran orang-utans are discussed in relation to the zoogeography of these two islands.

Keywords

PsychologyBiochemistry, Genetics and Molecular BiologyEnvironmental Science