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Females can be distinguished easily from males by having a light grey beard-like facial pelage.

Although levels of sexual dimorphism for most morphometric traits are very similar, indicating similar levels of male–male competition for females, the Singapore males exhibit a significantly larger testicular volume relative to body weight, suggestive of an alternative male reproductive strategy.

In addition to adult somatometric size and shape, comparisons of growth patterns relative to age and body size reveal significant differences between the two population samples.

For both males and females, the Singapore population is smaller than the Thai population.

Relative to body length, the Singapore macaques exhibit significantly longer tails, and, relative to cranial length, they exhibit significantly more narrow faces than the Thai macaques.

Isolation, coupled with genetic drift, resulted in the subspecific diversity of long-tailed macaques observed today, with nine commonly recognized subspecies ( is the most widely distributed, being found throughout much of the Indonesian archipelago including Bali, Java, Kalimantan, Sumatra, Sumba, Timor, peninsular Malaysia, Sabah, Sarawak, Borneo, the Philippines, Singapore, Thailand, and southern Vietnam (Fooden, 1971, 1982, 1995).

The pelage colouring of the long-tailed macaque subspecies varies considerably from a light to medium dark olive brown dorsally, and white to a light buff ventrally (Fig. Fooden (1995) describes the typically adult male dorsal pelage of museum specimens as varying from buffy to yellowish grey to golden brown to reddish brown to blackish.

The photographs have been scaled so that the distance between the lateral margins of the orbits is approximately the same for both males.) from Wat Tham Sala, Thailand (photograph by Nantiya Aggimarangsee).

The photographs have been scaled so that the distance between the lateral margins of the orbits is approximately the same for both males.

Anthropoidea, Cercopitecinae: ) is a frequent visitor, but likely no longer roosts on the island.

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