---
title: "Thomas’s Langur"
description: "Presbytis thomasi — Ssaki. Thomas's langur (Presbytis thomasi), also known as the North Sumatran leaf monkey or Thomas's leaf monkey, is a species of primate in the family Cercopithecidae."
canonical: https://animalchecklist.com/pl/animal/thomas-s-langur
last_updated: 2026-09-20
---

# Thomas’s Langur

> Presbytis thomasi — Ssaki. Thomas's langur (Presbytis thomasi), also known as the North Sumatran leaf monkey or Thomas's leaf monkey, is a species of primate in the family Cercopithecidae.

- Scientific name: *Presbytis thomasi*
- Category: `mammals` (Ssaki)
- Habitats: `forest` (Las)
- iNaturalist observations: 476
- Wikidata: [Q1345391](https://www.wikidata.org/wiki/Q1345391)
- iNaturalist taxon: [43501](https://www.inaturalist.org/taxa/43501)

## Names

- en: Thomas’s Langur
- de: Thomas-Langur
- es: Langur De Thomas
- fr: Semnopithèque de Thomas
- nl: Thomaslangoer

## Countries with the most observations

ID (461)

## Summary

Thomas's langur (Presbytis thomasi), also known as the North Sumatran leaf monkey or Thomas's leaf monkey, is a species of primate in the family Cercopithecidae. It is endemic to northern Sumatra, Indonesia, not living to the south and east of Lake Toba and the Alas and Wampu rivers. Its natural habitat is subtropical or tropical dry forests. It is threatened by habitat loss. Its native names are reungkah in Acehnese and kedih in Alas. It can be found in Gunung Leuser National Park, where substantial populations exist in Ketambe and Bukit Lawang.

Text: Wikipedia (en), CC BY-SA 4.0 — https://en.wikipedia.org/wiki/Thomas%27s_langur

## Photo

![Thomas’s Langur](https://animalchecklist.com/img/animals/thomas-s-langur/medium.jpg)

Photo: Ken Kneidel · CC0 · inaturalist — https://www.inaturalist.org/observations/9924623

## Machine access

`GET https://animalchecklist.com/api/v1/animals/thomas-s-langur?lang=pl` — see [openapi.json](https://animalchecklist.com/openapi.json).