Kaloula borealis
Boreal Digging Frog
family: Microhylidae
subfamily: Microhylinae

© 2009 Pierre Fidenci (1 of 7)

AmphibiaChina 中国两栖类.

Conservation Status (definitions)
IUCN (Red List) Status Least Concern (LC)
Other International Status None
National Status Republic of Korea: Endangered Class II
Regional Status None



View distribution map in BerkeleyMapper.

The body is stocky, with a small head and short, rounded snout. The dorsal skin is covered by irregularly scattered spots, and the ventral part is grey/white with scattered yellow speckles. There is no difference in size between males and females, however, males have folded vocal sacs and distinct black speckles in the throat area. Males do not have nuptial pads during breeding season.

Distribution and Habitat

Country distribution from AmphibiaWeb's database: China, Korea, Democratic People's Republic of, Korea, Republic of


View distribution map in BerkeleyMapper.

This species is found in China, the Democratic People's Republic of Korea, and the Republic of Korea. It lives in paddy fields and other cultivated fields, at elevations between 10-900 m asl (Matsui and Wenge 2004). It breeds in ponds, ditches, and rainwater pools.

Life History, Abundance, Activity, and Special Behaviors
Usually breeds during the rainy season. In the Republic of Korea, the breeding season occurs between June and July. These frogs otherwise hide in burrows and are nocturnal.

Trends and Threats

In the Republic of Korea, habitat loss (rice paddies, ditches and ponds) has caused K. borealis population numbers to decline.

Possible reasons for amphibian decline

General habitat alteration and loss
Drainage of habitat
Local pesticides, fertilizers, and pollutants


Song, J.-Y. (2007). A Field Guide Book of Amphibians and Reptiles in the Korean National Park, National Park Research Institute, Annual Report No. 2007-3. KNPS, Korea.

Written by Pierre Fidenci (pfidenci AT, Endangered Species International
First submitted 2009-06-22
Edited by Kellie Whittaker (2009-06-22)

Species Account Citation: AmphibiaWeb 2009 Kaloula borealis: Boreal Digging Frog <> University of California, Berkeley, CA, USA. Accessed Sep 23, 2020.

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Citation: AmphibiaWeb. 2020. <> University of California, Berkeley, CA, USA. Accessed 23 Sep 2020.

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