About Rana coreana Okada, 1928
This species, commonly called the Korean brown frog, is the smallest brown frog found in Korea. Males reach a maximum snout-vent length of 38 mm (1.5 in), while females reach up to 44 mm (1.7 in).
Korean brown frogs inhabit coniferous forests, mixed forests, deciduous forests, shrublands, and grasslands. They are most often found in open, wet locations such as wet meadows, swamps, riverbanks, and floodplains. They breed in shallow lakes, ponds, ditches, large puddles, and marshes. During hibernation, large groups of these frogs can be found in the bottom mud of ponds and pools.
While local populations of the Korean brown frog may be threatened by habitat loss, the common species as a whole is not considered threatened overall. Rana kunyuensis, which is now treated as a synonym of this species, has been assessed as Data Deficient by the International Union for Conservation of Nature.
