Thai National Parks

Reptiles of Thailand

Species of Thailand

Dumeril's monitor

Thai: ตุ๊ดตู่, tud dtoo

Binomial name: Varanus dumerilii, Hermann Schlegel, 1839

Dumeril's monitor (Varanus dumerilii) is a species of lizard, endemic to Southeast Asia. It is a member of the family Varanidae.


The specific name, dumerilii, is a Latinized form of the name of the scientist who first described this species, French herpetologist André Marie Constant Duméril.

Geographic range

Dumeril's monitor is found in southern Burma and north of the Isthmus of Kra to Kanchanaburi Province in Thailand, as well as in Peninsular Malaysia, throughout Borneo, Sumatra, Riau, Bangka–Belitung and other smaller islands of Indonesia.

Their habitat is dense evergreen forests with high humidity and mangrove swamps.


This monitor is a crab specialist; however, it has been observed eating snails, insects, molluscs, fish, frogs, and smaller rodents. Little is known overall about this species compared to other monitor lizards.


Adult Dumeril's monitors are largely dark coffee-brown in colour, with occasional brighter indistinct crossbars. For juveniles the colors and patterns are quite different. "The major color is a dark varnish black which is interrupted by several yellow crossways bars on the back." Juveniles have shiny orange red or, sometimes yellow heads. This youth coloration disappears after only 4–8 weeks. Adult Dumeril's can reach up to 4.5 m in total length (including tail) although typical length is 4 m long.


There are two described subspecies:

  • Varanus dumerilii dumerilii
  • Varanus dumerilii heteropholis

Note: Sprackland made V. d. heteropholis a synonym of V. d. dumerilii

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Scientific classification

Varanus dumerilii

Common names

  • German: Dumerilwaran
  • English: Dumeril monitor
  • Thai:
    • ตุ๊ดตู่, tud dtoo
    • เห่าช้างขาว, hao chang kao


  • Varanus dumerilii dumerilii, Hermann Schlegel, 1839

    Range: Thailand, Myanmar, West Malaysia, Indonesia, Sarawak, Singapore

  • Varanus dumerilii heteropholis, George Albert Boulenger, 1892

    Range: Sarawak, Malaysia


  • Varanus (Empagusia) dumerilii, André Koch (2013)
  • Varanus dumerilii, Eric Rodger Pianka & Laurie Joseph Vitt (2003)
  • Varanus dumerilii, Merel J. Cox et al. (1998)
  • Varanus dumerilii, Ulrich Manthey & Wolfgang Grossmann (1997)
  • Varanus (Empagusia) dumerilii, Thomas Ziegler & Wolfgang Böhme (1997)
  • Varanus dumerili heteropholis, H.F. De Lisle (1996)
  • Varanus dumerili dumerilii, H.F. De Lisle (1996)
  • Varanus (Tectovaranus) dumerilii dumerilii, Robert Mertens (1942)
  • Varanus dumerili heteropholis, Robert Mertens (1942)
  • Varanus heteropholis, Nelly de Rooij (1915)
  • Varanus dumerili, Nelly de Rooij (1915)
  • Varanus heteropholis, George Albert Boulenger (1892)
  • Varanus dumerilii, George Albert Boulenger (1885)
  • Varanus macrolepis, William Thomas Blanford (1881)
  • Varanus dumerilii, Pieter Bleeker (1858)
  • Varanus dumerili, Pieter Bleeker (1858)
  • Monitor dumerilii, Hermann Schlegel (1839)
  • Varanus dumerili dumerilii, Hermann Schlegel (1839)
Distribution map of Dumeril's monitor, Varanus dumerilii in Thailand

Range map of Varanus dumerilii in Thailand

Important note; our range maps are based on limited data we have collected. The data is not necessarily accurate or complete.

Special thanks to Ton Smits, Parinya Pawangkhanant, Ian Dugdale and many others for their contribution for range data.

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