Borneo Rainforest Lodge - Orang Utan Research

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General Information

Region:

Indonesia (Sumatra), Malaysia (Borneo)

Total population:

63,500 (7,500:Sumatra, 56,000:Borneo)

Density of Danum Valley :1.04individuals/km2 / Population size:498

Density of Borneo rainforest Lodge :2.7individuals/km2

Classification of Orangutan

Taxonomy	Sumatra	Borneo
Genus	Pongo	Pongo
Species	abelii	pygmaeus
Subspecies		P. p. pygmaeus P. p. wurmbii P. p. morio

Long life history:

Life Span: over 50 years old (wild)

Low reproductive speed:

• Maturity: Male 15 years / Female 10 years
• Birth Interval: 6-9 years
• Gestation:8.6months (260days)
• First Birth: over 15 years old

Largest arboreal mammal:

Weight:Male: 80 kg / Female: 35 kg

Material and Method

Study Area:	Borneo Rainforest Lodge（BRL） - 2km2 around the tourist lodge - Lowland Dipterocarpus Forest - This area is reserved for research, education and tourism. - N50°120″,E117°44″ - Altitude 231〜384m - Average temperature 28℃

The Content of Data:	Research Period： July 2004 –
	Total Observation Time: 1560hr (150 days) on 1/8/2007

Population in Borneo Rainforest Lodge

The Sex and Age Composition of Identified Individuals

We suppose at least 17 (includes 5 babies )are Resident out of 29 individuals

Two groups of population are in BRL

Feeding & Food Item

Parentage of the feeding time of each food items


Proportion of food items which orangutan especially eats


Acknowledgement