Japanese Brown Frog

The Japanese brown frog is slender and reddish brown, with a long, narrow head. Males average about 48mm in snout–vent length and females approximately 54mm. Neither sex possesses a vocal sac, although males sing during the January-to-March mating season and develop yellowish-brown nuptial pads. Each male call comprises approximately 10–20 notes. The firmly documented native range covers the Japanese islands of Honshu, Shikoku and Kyushu. (Wikipedia, general species account)