The rain frog is a species of amphibian belonging to the rain frog family. It is distributed in the northern part of South Korea and Mongolia, the northeastern part of China, and the southern part of the Russian Far East. The adult male body length of the rain frog is 2.6 to 4.5 centimeters, and the adult female body length is 2.6 to 4.1 centimeters. However, the average body length of adult males is 3.1 centimeters, and the average body length of adult females is 3.5 centimeters. They have disc-shaped objects on their toes for climbing. This frog is able to lay eggs or fertilize at the age of 3 or 4. They feed on various insects, mainly searching for food at dawn and dusk, but if insects approach, they also feed during the day.