Nonaggressive interventions by third parties in conflicts among captive Bornean orangutans (Pongo pygmaeus)

We investigated the efficacy of a drone equipped with a thermal camera as a potential survey tool to detect wild Bornean orangutans (Pongo pygmaeus) and other tropical primates. Using the thermal camera we successfully detected 41 orangutans and a troop of proboscis monkeys, all of which were confirmed by ground observers. We discuss the potential advantages and limitations of thermal-equipped drones as a tool to complement other methods, and the potential of this technology for use as a future survey tool.

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Are Male Orangutans a Threat to Infants? Evidence of Mother–Offspring Counterstrategies to Infanticide in Bornean Orangutans (Pongo pygmaeus wurmbii)

International Journal of Primatology ◽

10.1007/s10764-019-00097-8 ◽

2019 ◽

Vol 40 (3) ◽

pp. 435-455 ◽

Cited By ~ 2

Author(s):

Amy M. Scott ◽

Cheryl D. Knott ◽

Tri Wahyu Susanto

Keyword(s):

Pongo Pygmaeus ◽

Pongo Pygmaeus Wurmbii ◽

Bornean Orangutans

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Suspected Sunda clouded leopard (Neofelis diardi) predation attempts on two reintroduced Bornean orangutans (Pongo pygmaeus wurmbii) in Bukit Batikap Protection Forest, Central Kalimantan, Indonesia

Primates ◽

10.1007/s10329-020-00842-1 ◽

2020 ◽

Author(s):

Jacqueline L. Sunderland-Groves ◽

Maryos V. Tandang ◽

Fiet Hayu Patispathika ◽

Anna Marzec ◽

Andrea Knox ◽

...

Keyword(s):

Pongo Pygmaeus ◽

Clouded Leopard ◽

Central Kalimantan ◽

Protection Forest ◽

Pongo Pygmaeus Wurmbii ◽

Bornean Orangutans

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Home range establishment and the mechanisms of philopatry among female Bornean orangutans (Pongo pygmaeus wurmbii) at Tuanan

Behavioral Ecology and Sociobiology ◽

10.1007/s00265-020-2818-1 ◽

2020 ◽

Vol 74 (4) ◽

Cited By ~ 2

Author(s):

Alison M. Ashbury ◽

Erik P. Willems ◽

Sri Suci Utami Atmoko ◽

Fajar Saputra ◽

Carel P. van Schaik ◽

...

Keyword(s):

Home Range ◽

Pongo Pygmaeus ◽

Pongo Pygmaeus Wurmbii ◽

Bornean Orangutans

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Bornean orangutans on the brink of protein bankruptcy

Biology Letters ◽

10.1098/rsbl.2011.1040 ◽

2011 ◽

Vol 8 (3) ◽

pp. 333-336 ◽

Cited By ~ 46

Author(s):

Erin R. Vogel ◽

Cheryl D. Knott ◽

Brooke E. Crowley ◽

Melissa D. Blakely ◽

Michael D. Larsen ◽

...

Keyword(s):

G Protein ◽

Daily Intake ◽

Urinary Metabolites ◽

Pongo Pygmaeus ◽

Wild Animals ◽

Protein Balance ◽

Mountain Gorillas ◽

Fat Reserves ◽

Adaptive Value ◽

Bornean Orangutans

Protein is a limiting resource that is essential to the growth, maintenance and reproduction of tropical frugivores, yet few studies have examined how wild animals maintain protein balance. During chronic periods of fruit scarcity, Bornean orangutans ( Pongo pygmaeus ) often catabolize their own fat reserves despite unusually low metabolic requirements. Such energy deficits suggest a marginal existence, and raise the possibility that orangutans also endure periods of negative protein balance. To test this hypothesis, we conducted the first study of protein cycling in a wild primate. Our five year analysis of urinary metabolites revealed evidence of protein recycling when fruit was scarce. During these periods, orangutans consumed more leaves and bark, proteinaceous but tough foods that yielded a mean daily intake of 1.4 g protein kg −1 metabolic mass. Such an amount is inadequate for humans and one-tenth the intake of mountain gorillas, but sufficient to avert, perhaps narrowly, a severe protein deficit. Our findings highlight the functional and adaptive value of traits that maximize protein assimilation during periods of ecological exigency.

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