Boreal digging frog

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Boreal digging frog
Kaloula borealis01.jpeg
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Class: Amphibia
Order: Anura
Family: Microhylidae
Genus: Kaloula
K. borealis
Binomial name
Kaloula borealis
(Barbour, 1908)

The boreal digging frog (Kaloula borealis) is a species of microhylid, or "narrow-mouthed," frog found in Northeast Asia. Its range covers much of central and northeastern China, the Korean Peninsula, and Jeju Island.[2] Adult boreal digging frogs are roughly 4.5 cm in length, round in shape with toad-like speckled skin.[3] Tadpoles are up to 35 mm (1.4 in) in length.[4]

The boreal digging frog is common across much of its range,[1] but is listed as an "Endangered category II species" in South Korea.[3][5] It inhabits cultivated fields, including rice paddies, and is often found in close proximity to humanity, at altitudes of 10 to 900 m.[1]

Boreal digging frogs breed during the annual rainy season, around June and July. After the rainy season is over they dig burrows underground, emerging only at night to feed. The eggs are laid in batches of 15–20 in monsoonal pools, with the tadpoles maturing within 30 days, much faster than most other frogs in this area.[3]


  1. ^ a b c Matsui, Masafumi; Zhao, Wenge (2004). "Kaloula borealis". The IUCN Red List of Threatened Species. IUCN. 2004: e.T57849A11693398. doi:10.2305/IUCN.UK.2004.RLTS.T57849A11693398.en. Retrieved 3 January 2018.
  2. ^ Frost, Darrel R. (2014). "Kaloula borealis (Barbour, 1908)". Amphibian Species of the World: an Online Reference. Version 6.0. American Museum of Natural History. Retrieved 22 September 2014.
  3. ^ a b c "맹꽁이 (Narrow-mouth frog)". Naver Encyclopedia: Animals of the World. Retrieved 28 October 2013.
  4. ^ Fei, L. (1999). Atlas of Amphibians of China (in Chinese). Zhengzhou: Henan Press of Science and Technology. pp. 300–302. ISBN 7-5349-1835-9.
  5. ^ Park, Daesik; Kaplan, Robert H. (2013). "Korea regional update". FrogLog. 21 (4): 34–35.