Semnopithecus johnii
Silhouette: Kai R. Caspar · PhyloPic
In 3 days ~80% in a week >90%
The Nilgiri langur (Semnopithecus johnii) is an Asian langur of the Old World monkey. It has glossy, black fur and an orangey-golden brown, hair-like mane on its head. Females have a white patch of fur on the inner thigh. It typically lives in troops of nine to ten individuals, with or without offspring, depending on seasonality. Its diet consists of fruits, shoots and leaves. It is listed as vulnerable on the IUCN Red List and is threatened by habitat destruction and poaching for its body parts, thought to supposedly contain aphrodisiac properties.
The classification of the Nilgiri langur has been disputed. Traditionally it has been placed within the genus Trachypithecus based on morphological similarities such as cranial morphology and neonatal pelage color, and within the Trachypithecus vetulus group within Trachypithecus based on a presumed close relationship with the purple-faced langur (Semnopithecus vetulus), which had formerly been classified as T. vetulus. DNA and other evidence suggests that the Nilgiri and purple-faced langurs are more closely related to the gray langurs, and have thus been reclassified within the genus Semnopithecus.... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Periyar National Park | 🇮🇳 India | |
| 2 | Eravikulam National Park | 🇮🇳 India | |
| 3 | Mudumalai National Park | 🇮🇳 India |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Arignar Anna Zoological Park | 🇮🇳 India | |
| 2 | Thiruvananthapuram Zoo | 🇮🇳 India |
Likely
About 40% of wildlife watchers report a Black Leaf Monkey sighting in Eravikulam National Park on a given day, based on 109 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 2nd most-seen of the 5 mammals we can rate there. Over three days the chance rises to about 80%, and over a week to over 90%, if each day is a fresh chance.
April, September and December
In those months about 50% of wildlife watchers report a Black Leaf Monkey in Eravikulam National Park on a given day, against about 30% in January and May, the lowest months.
Between 5 and 8 am
Across all the parks we cover, that three-hour window holds the most Black Leaf Monkey sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is most active around dawn and dusk.
2nd of 3
Of the 3 parks where we can rate Black Leaf Monkey sightings, Eravikulam National Park ranks 2nd at about 40%. The best odds are in Periyar National Park (India, about 70%).
GBIF citizen-science records
It is estimated from how often the Black Leaf Monkey is recorded against all the mammals logged in Eravikulam National Park (109 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
