Thai National Parks

Species of Thailand

Blyth's fanged frog

Limnonectes blythii, George Albert Boulenger, 1920

(In Thai: กบทูด)

Blyth's river frog, Blyth's frog, giant Asian river frog, or (ambiguously) giant frog, Limnonectes blythii, is a species of frog in the Dicroglossidae family found from Myanmar through western Thailand and the Malay Peninsula (Malaysia, Singapore) to Sumatra and Borneo (Indonesia). Earlier records from Laos and Vietnam are considered misidentifications.


Blyth's river frog is a large frog. Females grow to a snout–vent length of 90 - 260 mm and males to 85 - 125 mm. Large adults can weigh more than 1 kg. The skin is smooth on the dorsum, with or without scattered tubercles or longitudinal skin folds. They are brownish, grey, or yellowish above and white or yellowish below. They may or may not have a vertebral stripe on their backs.


These frogs inhabit streams with gravel and rocks in primary and secondary evergreen forest. Males build a nesting hollow in a sandy stream bed area, and the larvae develop in streams. They can also be found far away from streams.

Use and conservation

The major threat to this species is collection for food, both for local consumption and for trade. It is also locally impacted by habitat loss.

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Scientific classification

Limnonectes blythii

Common names

  • English:
    • Blyth's fanged frog
    • Blyth's river frog
    • Giant Asian river frog
    • Giant frog
    • Blyth's frog
    • Malayan giant frog
  • Thai:
    • กบทูด
    • เขียดแลว


  • Rana macrodon var. blythii, George Albert Boulenger (1920)

Conservation status

Near Threatened (IUCN3.1)

Near Threatened (IUCN3.1)


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Limnonectes blythii
Limnonectes blythii
Limnonectes blythii
Limnonectes blythii
Limnonectes blythii
Limnonectes blythii
Limnonectes blythii

Range Map

Distribution map of Blyth's fanged frog, Limnonectes blythii in Thailand
  • Bang Lang National Park
  • Huai Kha Khaeng Wildlife Sanctuary
  • Huai Yang Waterfall National Park
  • Kaeng Krachan National Park
  • Khao Luang National Park
  • Khao Nam Khang National Park
  • Khao Pu - Khao Ya National Park
  • Khao Sok National Park
  • Ko Lanta National Park
  • Ko Samui District, Surat Thani
  • Kui Buri National Park
  • Lam Nam Kra Buri National Park
  • Namtok Mae Surin National Park
  • Ngao Waterfall National Park
  • Phu Chong Na Yoi National Park
  • Salawin National Park
  • San Kala Khiri National Park
  • Tarutao National Marine Park
  • Thalang District, Phuket
  • Thale Ban National Park
  • Thong Pha Phum National Park
  • Thung Song District, Nakhon Si Thammarat
  • Thung Yai Naresuan Wildlife Sanctuary
  • Umphang Wildlife Sanctuary
  • Yong Waterfall
Range map of Limnonectes blythii in Thailand