Thai National Parks

Species of Thailand

Large-eyed pit viper

Trimeresurus macrops

Eugen Kramer, 1977

In Thai: งูเขียวหางไหม้ตาโต, ngu khieow hang mai dtaa dtoo

Trimeresurus macrops is a venomous pit viper species endemic to Southeast Asia. No subspecies are currently recognized. Common names include large-eyed pitviper and green pit viper.


It can be distinguished from other green pit vipers by the relatively large size of its eyes, which is especially noticeable in adult specimens, and to which the specific name, macrops, refers.


According to Strine, Green pit vipers mate during the end of the rainy season, between September and October. Female vipers will pull male vipers up the tree and begin mating.

Geographic range

It is found in Southeast Asia in northern Cambodia, Laos, Thailand, and southern Vietnam. The type locality given is "Bangkok, Thailand".

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Scientific classification

Trimeresurus macrops

Common names

  • German: Grossaugen-Bambusotter
  • English:
    • Large-eyed pit viper
    • Kramer's pit viper
    • Big-eyed green pit viper
  • Thai: งูเขียวหางไหม้ตาโต, ngu khieow hang mai dtaa dtoo


  • Trimeresurus (Trimeresurus) macrops, Zeeshan A. Mirza et al. (2023)
  • Cryptelytrops macrops, Tanya Chan-Ard et al. (2015)
  • Trimeresurus macrops, Van Stanley Bartholomew Wallach et al. (2014)
  • Trimeresurus (Trimeresurus) macrops, Patrick David et al. (2011)
  • Cryptelytrops macrops, Anita Malhotra & Roger Stephen Thorpe (2004)
  • Trimeresurus macrops, Andreas Gumprecht et al. (2004)
  • Trimeresurus macrops, Roy W. McDiarmid, Jonathan A. Campbell & T'Shaka A. Touré (1999)
  • Trimeresurus macrops, Merel J. Cox et al. (1998)
  • Trimeresurus macrops, Kenneth R. G. Welch (1994)
  • Trimeresurus macrops, Eugen Kramer (1977)

Conservation status

Least Concern (IUCN3.1)

Least Concern (IUCN3.1)


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Trimeresurus macrops - Phu Suan Sai National Park
Large-eyed pit viper - Khao Yai National Park
Trimeresurus macrops - Namtok Sam Lan National Park
Trimeresurus macropsTrimeresurus macrops - Namtok Sam Lan National Park
Trimeresurus macrops

Range Map

Distribution map of Large-eyed pit viper, Trimeresurus macrops in Thailand
  • Bang Khae District, Bangkok
  • Bang Kruai District, Nonthaburi
  • Bang Pa In District, Phra Nakhon Si Ayutthaya
  • Bang Pahan District, Phra Nakhon Si Ayutthaya
  • Bang Phlat District, Bangkok
  • Bang Sue District, Bangkok
  • Bangkok Province
  • Bangkok Noi District, Bangkok
  • Bangkok Yai District, Bangkok
  • Chae Son National Park
  • Chatuchak District, Bangkok
  • Chom Thong District, Chiang Mai
  • Chonnabot District, Khon Kaen
  • Doi Khun Tan National Park
  • Doi Suthep - Pui National Park
  • Huai Kha Khaeng Wildlife Sanctuary
  • Kaset Sombun District, Chaiyaphum
  • Kham Thale So District, Nakhon Ratchasima
  • Khao Kho District, Phetchabun
  • Khao Phra Wihan National Park
  • Khao Yai National Park
  • Khlong Luang District, Pathum Thani
  • Khlong San District, Bangkok
  • Lak Si District, Bangkok
  • Lan Sak District, Uthai Thani
  • Lat Phrao District, Bangkok
  • Mae Taeng District, Chiang Mai
  • Mueang Chainat District, Chainat
  • Mueang Khon Kaen District, Khon Kaen
  • Mueang Maha Sarakham District, Maha Sarakham
  • Mueang Nakhon Nayok District, Nakhon Nayok
  • Mueang Nakhon Sawan District, Nakhon Sawan
  • Mueang Nonthaburi District, Nonthaburi
  • Mueang Pathum Thani District, Pathum Thani
  • Mueang Phetchabun District, Phetchabun
  • Mueang Ratchaburi District, Ratchaburi
  • Mueang Samut Prakan District, Samut Prakan
  • Mueang Saraburi District, Saraburi
  • Na Chaluai District, Ubon Ratchathani
  • Nam Yuen District, Ubon Ratchathani
  • Namtok Sam Lan National Park
  • Nong Bua Daeng District, Chaiyaphum
  • Nong Wua So District, Udon Thani
  • Pak Chong District, Nakhon Ratchasima
  • Pak Kret District, Nonthaburi
  • Pak Phli District, Nakhon Nayok
  • Pang Sida National Park
  • Phasi Charoen District, Bangkok
  • Phaya Thai District, Bangkok
  • Phra Khanong District, Bangkok
  • Phra Nakhon Si Ayutthaya District, Phra Nakhon Si Ayutthaya
  • Phra Pradaeng District, Samut Prakan
  • Phu Chong Na Yoi National Park
  • Phu Khiao Wildlife Sanctuary
  • Phu Suan Sai National Park
  • Phu Wiang District, Khon Kaen
  • Phu Wua Wildlife Sanctuary
  • Ramkhamhaeng National Park
  • Rat Burana District, Bangkok
  • Sakaerat Environmental Research Station
  • Sam Chuk District, Suphan Buri
  • Sam Khok District, Pathum Thani
  • Sikhio District, Nakhon Ratchasima
  • Sung Noen District, Nakhon Ratchasima
  • Ta Phraya National Park
  • Taling Chan District, Bangkok
  • Thap Lan National Park
  • Thawi Watthana District, Bangkok
  • Thung Salaeng Luang National Park
  • Wang Nam Khiao District, Nakhon Ratchasima
Range map of Trimeresurus macrops in Thailand