About Rana japonica Boulenger, 1879
Defining characteristics of Rana japonica Boulenger, 1879 include a slender, reddish-brown body and a long, narrow head. On average, males have a snout-vent length of 48 mm (0.157 ft). Females are typically much larger than males, with an average snout-vent length of around 54 mm (0.177 ft). Neither males nor females have a vocal sac, but males develop yellowish-brown nuptial pads. Males also sing during the January to March mating season, and their songs contain 10 to 20 notes. R. japonica is distributed from Honshu, Shikoku, and Kyushu in Japan to the southern region of China. In Japan, it mostly inhabits hillsides and plains, and is rarely found in mountain ranges. It specifically lives in temperate grasslands, hillsides, plains, rivers, swamps, irrigated land, and seasonally flooded agricultural land.
