SEASONAL MIGRATION AND POPULATION-STRUCTURE OF SUMATRAN ORANGUTANS (PONGO-PYGMAEUS-ABELII) IN THE GUNUNG-LEUSER NATIONAL-PARK, SUMATRA, INDONESIA - A PROGRESS REPORT
I. Singleton, SEASONAL MIGRATION AND POPULATION-STRUCTURE OF SUMATRAN ORANGUTANS (PONGO-PYGMAEUS-ABELII) IN THE GUNUNG-LEUSER NATIONAL-PARK, SUMATRA, INDONESIA - A PROGRESS REPORT, Dodo, 33, 1997, pp. 158-159