Thai National Parks

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, Vietnam. and Nepal


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.

Geographic range

It is found in India, Bangladesh, Myanmar, Cambodia, Thailand, Nepal, Malaysia, and Vietnam. It is also found in Laos.


These snakes are found in forest-hills and plains and can be found up to 1, 700 m (5, 577 ft.). 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)

Conservation status

Least Concern (IUCN 3.1)

Least Concern (IUCN 3.1)


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Boiga siamensis
Boiga siamensis, Kaeng Krachan National Park
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
  • Chanuman District, Amnat Charoen
  • Chiang Dao District, Chiang Mai
  • Chiang Saen District, Chiang Rai
  • Chok Chai District, Nakhon Ratchasima
  • 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)
  • Khao Yai National Park
  • Khlong Lan District, Kamphaeng Phet
  • Khong Chiam District, Ubon Ratchathani
  • Khun Tan District, Chiang Rai
  • Kui Buri National Park
  • Mae Chaem District, Chiang Mai
  • Mae Rim District, Chiang Mai
  • Mae Sai District, Chiang Rai
  • Mae Sot District, Tak
  • Muak Lek District, Saraburi
  • Mueang Chiang Mai District, Chiang Mai
  • Mueang Kanchanaburi District, Kanchanaburi
  • Mueang Mae Hong Son District, Mae Hong Son
  • Mueang Phetchaburi District, Phetchaburi
  • Mueang Prachinburi District, Prachinburi
  • Mueang Ratchaburi District, Ratchaburi
  • Mueang Sa Kaeo District, Sa Kaeo
  • Na Di District, Prachinburi
  • Na Haeo District, Loei
  • Nakhon Thai District, Phitsanulok
  • Noen Maprang 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 Kradueng National Park
  • Phu Langka National Park
  • Pong District, Phayao
  • Pong Nam Ron District, Chanthaburi
  • Pua District, Nan
  • Ramkhamhaeng National Park
  • Rong Kwang District, Phrae
  • Sai Yok National Park
  • Sakaerat Environmental Research Station
  • Sangkhom District, Nong Khai
  • Sawi District, Chumphon
  • Suan Phueng District, Ratchaburi
  • Tat Mok National Park
  • Tha Takiap District, Chachoengsao
  • Tha Wang Pha District, Nan
  • Thong Pha Phum District, Kanchanaburi
  • Thung Yai Naresuan Wildlife Sanctuary
  • Umphang District, Tak
  • Wang Nam Khiao District, Nakhon Ratchasima
  • Wat Bot District, Phitsanulok
  • Wiang Kao District, Khon Kaen
Range map of Boiga siamensis in Thailand