Thai National Parks

Species of Thailand

White-bellied rat snake

Ptyas fusca

(Albert Charles Lewis Günther, 1858)

In Thai: งูสิงใต้, ngu sing dtai

Ptyas fusca, commonly known as the white-bellied rat snake or brown rat snake, is a species of colubrid snake. It is found in Indonesia, Brunei, Malaysia, Thailand and Singapore.

The white-bellied rat snake prefers forested habitats. They are known to prey on frogs and lizards and fish. It is known to remain still and hold neck erect when disturbed-a threatening posture.

The adults range from brown to brick-red colour on the upper surface. Ventral scales are white to pale yellowish in colour. Thick black stripes on either side of the posterior body and tail is a characteristic feature. Juveniles often greenish in coloration. The pupil is rounded and large.

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Scientific classification

Ptyas fusca

Common names

  • German: Braune Rattenschlange
  • English:
    • White-bellied rat snake
    • Brown rat snake
  • Thai:
    • งูสิงใต้, ngu sing dtai
    • งูสิงทอง, ngu sing thong


  • Ptyas fusca, Van Stanley Bartholomew Wallach et al. (2014)
  • Ptyas fusca, Patrick David & Indraneil Das (2004)
  • Ptyas fuscus, Rudolf Malkmus et al. (2002)
  • Ptyas fuscus, Merel J. Cox et al. (1998)
  • Ptyas fuscus, Patrick David & Gernot Vogel (1996)
  • Zaocys fuscusv, Ulrich Manthey (1983)
  • Zaocys fuscus, Ulrich Manthey (1983)
  • Zaocys fuscus, Alice Georgie Cruickshank Grandison (1978)
  • Ptyas fuscus, Frank Wall (1923)
  • Zaocys fuscus, George Albert Boulenger (1893)

Conservation status

Least Concern (IUCN3.1)

Least Concern (IUCN3.1)


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Ptyas fusca
Ptyas fusca
Ptyas fusca
Ptyas fusca

Range Map

Distribution map of White-bellied rat snake, Ptyas fusca in Thailand
  • Betong District, Yala
  • Hala-Bala Wildlife Sanctuary
  • Huai Yang Waterfall National Park
  • Kathu District, Phuket
  • Khao Lak - Lam Ru National Park
  • Khao Luang National Park
  • Khao Phanom Bencha National Park
  • Khao Phra Thaeo Wildlife Sanctuary
  • Khao Sok National Park
  • Kui Buri National Park
  • Mueang Phang Nga District, Phang Nga
  • Mueang Ranong District, Ranong
  • Na Yong District, Trang
  • Raman Waterfall Forest Park
  • Sri Phang-nga National Park
  • Takua Thung District, Phang Nga
  • Tha Sala District, Nakhon Si Thammarat
  • Ton Nga-Chang Wildlife Sanctuary
  • Yong Waterfall National Park
Range map of Ptyas fusca in Thailand