Facts about Purple-faced Langurs
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Mothers and infants maintain physical contact through a specialized clinging behavior where young purple-faced langurs grasp their mother's fur during the first six months of life.
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Long-distance arm-swinging locomotion allows purple-faced langurs to traverse canopy gaps up to 15 meters wide while maintaining group cohesion across fragmented forest patches.
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Sri Lankan rainforests support fewer than 3,000 purple-faced langurs across fragmented habitat patches, with some populations isolated in just 2 or 3 remaining forest reserves.
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Vocalizations in purple-faced langurs include loud alarm calls audible up to 1 kilometer away that alert group members to predators like leopards and eagles.
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Facial coloration in purple-faced langurs intensifies with age, with infants born with pale pink or whitish faces that deepen to dark purple by adulthood.
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In 2012, purple-faced langurs were classified as Endangered on the IUCN Red List due to habitat loss reducing their population to fewer than 3,000 individuals in the wild.
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Leaves and unripe seeds comprise approximately 90 percent of the purple-faced langur's diet, making them highly specialized folivores adapted to their rainforest habitat.
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Purple-faced langurs live in groups of 4 to 27 individuals that occupy and defend distinct territories within Sri Lankan rainforests.
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Their distinctive dark purple facial skin lacks fur and becomes more intensely colored as male purple-faced langurs mature into adulthood.
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Weighing between 5.5 and 8.5 kilograms, purple-faced langurs inhabit the wet zone forests of Sri Lanka exclusively.