Possible antipredator behavior associated with river crossings by proboscis monkeys (Nasalis larvatus)

@article{Yeager1991PossibleAB,
  title={Possible antipredator behavior associated with river crossings by proboscis monkeys (Nasalis larvatus)},
  author={Carey P. Yeager},
  journal={American Journal of Primatology},
  year={1991},
  volume={24}
}
  • C. Yeager
  • Published 1991
  • Biology
  • American Journal of Primatology
Proboscis monkeys' (Nasalis larvatus) river crossing behavior was examined as a potential behavioral response to predation threat. N. larvatus' major predator at the Tanjung Puting National Park in Kalimantan Tengah, Indonesia, appeared to be the false gavial (Tomistoma schlegeli), a crocodilian. An adolescent female proboscis monkey was captured and drowned by a false gavial during this study. The monkeys crossed the river at its more narrow points, with several individuals or groups crossing… 

Clouded leopard (Neofelis diardi) predation on proboscis monkeys (Nasalis larvatus) in Sabah, Malaysia

It is suggested that clouded leopard and crocodile might be significant potential predators of proboscis monkeys of any age or sex and that predation threats elicit the monkeys’ anti-predator strategies.

Selection of river crossing location and sleeping site by proboscis monkeys (Nasalis larvatus) in Sabah, Malaysia

The frequency of river crossings for focal monkeys in the BE‐Group was significantly higher at locations with narrow branch‐to‐bank distances, and sleeping sites locations that offer arboreal escape routes may protect proboscis monkeys from leopard attack.

Proboscis monkey (Nasalis larvatus) social organization: Nature and possible functions of intergroup patterns of association

  • C. Yeager
  • Biology
    American journal of primatology
  • 1992
Proboscis monkey socioecology was studied at the Natai Lengkuas Station, Tanjung Puting National Park, in Kalimantan Tengah, Indonesia and associations between groups may play a role in displacement avoidance and/or predation avoidance.

Ranging Behavior of Proboscis Monkeys in a Riverine Forest with Special Reference to Ranging in Inland Forest

Not only food availability but also the risk of predation appears to influence the ranging of the BE-Group, a unimale group of proboscis monkeys along the Menanggul River, Sabah, Malaysia.

Sleeping site selection by proboscis monkeys (Nasalis larvatus) in West Kalimantan, Indonesia

This study has shown that proboscis monkeys (at Sungai Tolak) have a very strong preference for large trees located near the river, which may exacerbate the problems of forest loss for these endangered monkeys.

RIVER CROSSINGS IN MEXICAN MONKEYS

During a nine month field study, we assess the ability of spider (Ateles geoffroyi) and howler (Alouatta pigra) monkeys to cross a large Mesoamerican river, and if this behavior is related to

Social behaviors of all-male proboscis monkeys when joined by females

In a riverine forest along the Menanggul River, which is a tributary of the Kinabatangan River, Sabah, Malaysia, I observed an all-male group of proboscis monkey (Nasalis larvatus) consisting of

PROBOSCIS MONKEYS (NASALIS LARVATUS (WURMB, 1787)) HAVE UNUSUALLY HIGH-PITCHED VOCALIZATIONS

The high pitch vocalizations of captive proboscis monkeys in the Singapore Zoological Gardens are analysed and it is discussed that the high frequency may be an adaptation for predator avoidance (crocodiles) and/or communication in dense vegetation.

Inter-individual relationships in proboscis monkeys: a preliminary comparison with other non-human primates

Although the agonistic behaviour matrix based on the 33 intra-group agonistic events was indicative of non-significant linearity, there were some specific dominated individuals within the group of proboscis monkeys Nonetheless, grooming behaviour among adult females within a group were not affected by the dominance hierarchy.

Nasalis larvatus (Primates: Colobini)

Nasalis larvatus, proboscis monkey, is the only member of its genus and is the largest colobine monkey, which has a uniquely large nose in males.
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References

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Proboscis monkey (Nasalis larvatus) social organization: Intergroup patterns of association

  • C. Yeager
  • Biology
    American journal of primatology
  • 1991
Proboscis monkey social organization was studied at the Natai Lengkuas station, Tanjung Puting National Park in Kalimantan Tengah, Indonesia and indicated that the groups formed two separate bands, the first evidence for such a two‐tiered system of organization in an arboreal colobine species.

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  • C. Yeager
  • Biology
    American journal of primatology
  • 1990
Proboscis monkey social organization was studied at the Tanjung Puting National Park in Kalimantan Tengah, Indonesia and one‐male groups appear to be “female bonded”; adult females direct affiliative behaviors towards their offspring and other adult females, not towards the male.

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  • C. Yeager
  • Biology, Psychology
    American journal of primatology
  • 1990
Proboscis monkey sexual behavior was studied at the Tanjung Puting National Park in Kalimantan Tengah, Indonesia, for 12 months using event sampling for copulations, presents, and same‐sex mounts.

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