Thai National Parks

Species of Thailand

Kra stream toad

Ansonia kraensis, Masafumi Matsui, Wichase Khonsue & Jarujin Nabhitabhata, 2005

(In Thai: คางคกห้วยระนอง)

Ansonia kraensis (Kra stream toad) is a species of toad in the Bufonidae family. It is found on the Kra Isthmus, Thailand. It is morphologically similar to Ansonia malayana from Malaysia, but differs from it in ventral coloration and larval morphology. The exact threats are unknown but are likely forest loss for logging and agricultural expansion.


Ansonia kraensis males measure 20 - 22 mm and females 24 - 28 mm in snout–vent length. Tympanum is visible. Dorsum is brown with darker markings, and has small and minute warts, some of them with orange-yellow tips. Limbs have orange-yellow crossbars. Tadpoles are up to 23 mm in length. Their body is flattened, dorsally black with two transverse light bands, and ventrally unpigmented. Oral disc is large.


Ansonia kraensis is a forest species found near streams, sometimes also near seepages some distance away from streams. Tadpoles have been found in a small stream with moderate flow, clinging to the rocks.

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Scientific classification

Ansonia kraensis

Common names

  • English:
    • Kra stream toad
    • Isthmus of Kra Stream Toad
  • Thai: คางคกห้วยระนอง

Conservation status

Data Deficient (IUCN3.1)

Data Deficient (IUCN3.1)


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Ansonia kraensis - Ngao Waterfall National Park
Ansonia kraensis - Ngao Waterfall National Park
Ansonia kraensis - Ngao Waterfall National Park
Ansonia kraensis - Ngao Waterfall National Park

Range Map

Distribution map of Kra stream toad, Ansonia kraensis in Thailand
  • Khlong Yan Wildlife Sanctuary (s/e)
  • Lam Nam Kra Buri National Park
  • Ngao Waterfall National Park
Range map of Ansonia kraensis in Thailand