White-faced saki monkey
| White-faced saki | |
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| Male white-faced saki (Pithecia pithecia) | |
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| Female white-faced saki | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Primates |
| Suborder: | Haplorhini |
| Infraorder: | Simiiformes |
| Family: | Pitheciidae |
| Genus: | Pithecia |
| Species: | P. pithecia |
| Binomial name | |
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Pithecia pithecia (Linnaeus, 1766) | |
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| White-faced saki range | |
| Synonyms | |
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The white-faced saki (Pithecia pithecia), called the Guianan saki and the golden-faced saki, is a species of the New World saki monkey. They can be found in Brazil, French Guiana, Guyana, Suriname and Venezuela. This species lives in the understory and lower canopy of the forest, feeding mostly on fruits, nuts, seeds, and insects. Although they are arboreal creatures and are specialists of swinging from tree to tree (brachiation), they are also terrestrial when foraging. White-faced sakis typically live around 14 years in their natural habitat and have been recorded to live up to 36 years in captivity. Sakis are active in the day and sleep highly elevated (15-20m) in trees with many leaves to shelter them from weather and flying predators. [6]
A formerly recognized subspecies of this monkey, P. p. chrysocephala, was elevated to full species status as P. chrysocephala in 2014.
In captivity, female white-faced sakis experience ovarian cycles of approximately 17 days, and a gestational period of 20–21 weeks. Following birth, the mother undergoes a period of lactationally-induced infertility lasting 23 weeks, on average. White faced sakis breed once a year (in the spring) and only have one offspring.
White-faced sakis display noticeable sexual dimorphism in their coloration and also in size. Females have shorter hair than males, with brownish-grey fur and white or pale brown stripes around the corners of the nose and mouth. Males, on the other hand, have blacker fur, with a reddish-white forehead, face, and throat. Their faces are much whiter than females and males are larger in body size. [4][6] Males are approximately 500 grams heavier than females. [11] Young saki males are often identified as females because of their sometimes "grizzling" dorsal hair and orangish bellies and it is approximately 2 months of age when males and females being to show differences, although it gradually becomes obvious over a few years.[4]
A pair often mates for life, and they are very devoted to one another. They will strengthen their bond by grooming one another. Male saki monkeys are usually more active than females. They are considered monogamous, but have seldomly been observed over a long period of time and many primatologists question their behavior as being "typical monogamy" because of their inconsistent group numbers and possible seasonal effect on congregations. A South American study performed by Shawn M. Lehman shows that their group number can range from 2-12 group members, with higher numbers typically occurring (but not exclusively) in Guyana, South America. But most widespread observations conclude that they travel in small groups of 2 and 3 which usually include the bonded parents and the offspring; they travel approximately 0.5 to 1.25 miles in search of food or other resources during the early morning and day, when they are most active. [12][11]
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