Species of Thailand

Siamese cat snake

Boiga siamensis, Wirot Nutaphand, 1971

(In Thai: งูแส้หางม้าเทา, ngu sae hang ma thao)

The gray cat snake (Boiga siamensis), also known as eyed cat snake or Siamese cat snake is a species of catsnake found in northeastern India, Bangladesh, Myanmar, Cambodia, Thailand, Malaysia, and Vietnam.


The Siamese cat snake resembles the dog-toothed snake but it occupies a different geographical range. It is a large snake, reaching almost 2 m (6 1⁄2 ft) in total length. Colours are greyish-brown with black crossbars that are most distinct interiorly. The head is dark brown with a dark streak from behind the eye to the first body crossbar that is broken just beyond the last supralabial. The chin and throat are white, the ventrals white to light brown.

Behavior and venom

Mostly nocturnal, it is a potentially aggressive snake. It is a rear fanged venom snake but there are not known casualties registered. In 2014 while a study for the Prayao forest department (Thailand), herpetologist Frank Cuesta was bitten by a juvenile. The bite caused a very large edema along the entire arm and had to be treated at a hospital for over a month.

Geographic range

India, Bangladesh, Myanmar, Cambodia, Thailand, Malaysia, and Vietnam.


These snakes are found in forest-hills and plains and can be found up to 1, 700m. They are arboreal but can be found near water too.


This snake feeds on, birds, and eggs.


Boiga siamensis is an oviparous species, with sexually mature females laying eggs, 6-12 per clutch.

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Scientific classification

Boiga siamensis

Common names

  • German: Graue Katzennatter
  • English:
    • Siamese cat snake
    • Gray cat snake
    • Eyed cat snake
  • Thai: งูแส้หางม้าเทา, ngu sae hang ma thao


  • Boiga siamensis naranjita, Frank Cuesta, 2015

    Range: Found only in the provinces of Nan and Phayao in the North of Thailand.


  • Boiga siamensis, Van Stanley Bartholomew Wallach et al. (2014)
  • Boiga ocellata, Patrick David et al. (2004)
  • Boiga ocellata, Romulus Whitaker & Ashok Captain (2004)
  • Boiga ocellata, Jarujin Nabhitabhata et al. (2000)
  • Boiga ocellata, Tanya Chan-Ard et al. (1999)
  • Boiga ocellata, Merel J. Cox et al. (1998)
  • Boiga ocellata, C. Kroon (1973)
  • Boiga siamensis, Wirot Nutaphand (1971)


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Boiga siamensis
Boiga siamensis, Kaeng Krachan NP
Boiga siamensis
Boiga siamensis
Boiga siamensis
Boiga siamensis
Boiga siamensis (juvenile)
Boiga siamensis (juvenile)
Siamese cat snake (juvenile)

Range Map

Distribution map of Siamese cat snake, Boiga siamensis in Thailand
  • Ban Dan Lan Hoi District, Sukhothai
  • Ban Lat District, Phetchaburi
  • Ban Rai District, Uthai Thani
  • Bang Saphan District, Prachuap Khiri Khan
  • Chaloem Phra Kiat District, Saraburi
  • Chiang Dao District, Chiang Mai
  • Chiang Saen District, Chiang Rai
  • Doi Saket District, Chiang Mai
  • Hang Dong District, Chiang Mai
  • Huai Kha Khaeng Wildlife Sanctuary
  • Kaeng Krachan District, Phetchaburi
  • Kaeng Krachan National Park
  • Khao Dinsor (Chumphon Raptor Center)
  • Khlong Lan District, Kamphaeng Phet
  • Khun Tan District, Chiang Rai
  • Kui Buri National Park
  • Mae Rim District, Chiang Mai
  • Muak Lek District, Saraburi
  • Mueang Chiang Mai District, Chiang Mai
  • Mueang Kanchanaburi District, Kanchanaburi
  • Mueang Phetchaburi District, Phetchaburi
  • Mueang Prachinburi District, Prachinburi
  • Na Di District, Prachinburi
  • Nakhon Thai District, Phitsanulok
  • Non Daeng District, Nakhon Ratchasima
  • Nong Bua Daeng District, Chaiyaphum
  • Nong Wua So District, Udon Thani
  • Nong Ya Plong District, Phetchaburi
  • Omkoi District, Chiang Mai
  • Pai District, Mae Hong Son
  • Pak Chom District, Loei
  • Phu Langka National Park
  • Pong District, Phayao
  • Pua District, Nan
  • Ramkhamhaeng National Park
  • Rong Kwang District, Phrae
  • Sai Yok National Park
  • Sakaerat Environmental Research Station
  • Sawi District, Chumphon
  • Suan Phueng District, Ratchaburi
  • Tat Mok National Park
  • Tha Takiap District, Chachoengsao
  • Tha Wang Pha District, Nan
  • Thung Yai Naresuan Wildlife Sanctuary
  • Umphang District, Tak
Range map of Boiga siamensis in Thailand