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    Chapter

    Orangutan Life History and VORTEX Analysis

    The Working Group on Life History Characteristics of the Population and Habitat Viability Analysis Workshop relied primarily on unpublished data on orangutans collected at Ketambe, Gunung Leuser National Park,...

    M. Leighton, U. S. Seal, K. Soemarna, Adjisasmito, M. Wijaya… in The Neglected Ape (1995)

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    Chapter

    Estimates of Orangutan Distribution and Status in Borneo

    At the Population and Habitat Viability Analysis (PHVA) Workshop for Orangutans, estimates of habitat and population numbers for orangutans (Pongo pygmaeus pygmaeus) in Borneo were derived from various sources. F...

    H. D. Rijksen, W. Ramono, J. Sugardjito, A. Lelana, M. Leighton… in The Neglected Ape (1995)

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    Chapter

    Attentiveness in Orangutans within the Sign Learning Context

    Orangutans are capable of reliably associating specific referents by producing unique gestures within a sign learning context (Shapiro, 1982). An analysis of sign performance by four juvenile orangutans indica...

    G. Shapiro, B. M. F. Galdikas in The Neglected Ape (1995)