|Distribution of P. perrieri|
Perrier's sifaka (Propithecus perrieri) is a sifaka endemic to Madagascar. It was once formerly a subspecies of diademed sifaka and is considered one of the 25 most endangered primates in the world.
It has a length of 85 to 92 centimeters, of which 42-46 centimeters are tail. Its pelage is almost entirely black covering everywhere on their body except for their face and ears. They have small, forward-facing eyes. The species have masses ranging from 3.7 to 6.0 kg. They have minimal sexual dimorphism, however females are slightly larger mass on average.
Perrier's sifaka has a very limited range in northeastern Madagascar between the Irodo River to the north and the Lokia River to the south. The species' geographic range is concentrated on the Analamerana Special Reserve managed by Madagascar National Parks and in the Andrafiamena Protected Area managed by the NGO Fanamby. Its presence in the Ankarana National Park has been reported a few decades ago but could unfortunately not be confirmed in the last decade.
The diet of Perrier's sifaka resembles that of other sifakas, consisting of fruit, leaves, ﬂowers, buds, petioles, and seeds. Sifakas are naturally suited for this herbivorous diet because they have long gastrointestinal tracts and enlarged cecums. Groups of sifaka do not show any aggression towards other groups when feeding, let alone come into contact with each other. Sifakas in general show seasonal variation in diet. During the wet season, Perrier's sifakas contribute most of their feeding time, about 70 to 90 percent of it, to fruits and seeds, but in the dry season most of the species feeding time is spent on leaves and flowers.
Perrier's sifakas use vocalizations to communicate including warning calls and have even been observed to make a sound described as sneezing.
Sifakas have groups between 2 and 6 individuals. Dispersal of sex is unbiased, which is uncommon among most species. Aggression between groups is extremely low as well as the overall encounter rates between groups. Society is largely matriarchal and females have feeding priority. Mating habits have not been thoroughly studied yet.
The reproductive cycle is bound to the season and sifakas reproduce either every year or every two years. Infants have a slow growth rate given the large abundance of food on Madagascar, but dental development is just the opposite. A hypothesis has been put forth that this is to reduce the dependency period of the offspring and increase the chance of survival for the mother, who does not have to expend energy and time to raise her offspring. Most females do not place much effort into individual offspring, as half of sifaka infants die before the age of one. Infants become dependent at the age of 2 and reach sexual maturity at the age of 4 for females and at the age of 5 for males. Males use genital swelling to communicate that they are ready for sex.
Perrier's sifaka is one of the most endangered primates due to the limited distribution and low population density. A recent conservation plan for the Perrier's sifaka has been developed following the International Union for Conservation of Nature (IUCN) Species Survival Commission (SSC) Lemur Red List reassessment meeting in Antananarivo in 2012. While selective logging still seems to be one of the main threads in Analamerana special reserve, deforestation for slash and burn agriculture and for charcoal production is predominant in Andrafiamena protected area.
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