Jeju Gotjawal


맹꽁이 (Boreal Digging Frog) Kaloula borealis 맹꽁이과

by on Jun.08, 2012, under amphibian

Characteristics : Its body is round shaped and mouth is small and short. It is yellow and light blue on the back, and it has black stripe on the yellow stomach.


Ecology : Except during the spawning season, it mostly lives on land. It hides between the rocks or under the ground during the day and gets active in the night. Like other frogs, it lures the female by sound. It comes up on the ground to mate and spawn in the rainy season. Its eggs hatch in 28~30 hours and finish metamorphosis when they are about 30 days old. Boreal Digging Frogs goes through metamorphosis faster than other frogs since they spawn in the pond or puddle made in the rainy season.


Where you can see this specie at Dongbaekdongsan : You can easily hear them crying in the night after a rain in summer. Especially it can be seen in surrounding swamp in the rainy season more easily than in Munmulggak which has rather stable water level.

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Jeju Salamander (Hynobius quelpartensis) 제주도롱뇽

by on Aug.23, 2010, under amphibian


Characteristics : There are many dark brown spots on its brown body. Especially spots from the back of its eyes to its back are clear. Small black dots on the head and the end of tail are very dense. The size of adult male is about 6cm, and female is 6.3cm.


Ecology : It’s hardly seen around water except during egg-laying. It hides itself under a rock or an withered tree in the day, but at night it moves around seeking for food. It lays its eggs in March or April, but if the weather is warm, it does even in January or February. Its banana-shaped egg-sac is attached on the bottom of a rock or fallen leaves. Each egg-sac has 30~70 eggs inside. In the larval stage when it only lives in water, it respires through its gill. When it grows to be an adult, the gill atrophies.


Where you can see this species at Dongbaekdongsan : At ponds, wetlands, under rotten trees or a wet rock. You can see plenty of spawns at ‘Meonmulkkak’ and other wetlands around it in spring.

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Black-spotted Pond Frog (Rana nigromaculata) 참개구리

by on Aug.05, 2010, under amphibian


Characteristics : Black-spotted Pond Frog is individually varied a lot. Background color of its back is generally green, brown, fallow and yellow. Center line of back has a vertical line to the anus from the tip of mouth but some of individuals haven’t center line. Right and left back have a vertical line. An adult’s size is generally 6~9cm, a female is bigger than male and they are different with color. Male’s backgound is green and it has clear light blue or light yellow line by center to the anus from the tip of mouth.

Ecology : It usually lives around a pond or marsh. From the middle of April in a pond, valley, marsh and rice paddy, it lays a big spawn, 20cm in diameter, which consists of 2000~4000 eggs. The spawn is not sticky, so it is not stuck on other things and the eggs hatch in water.

Where you can see this species at Dongbaekdongsan : It can be seen at a pond or around a marsh. Especially at Meonmulkkak marsh, it is easily seen in from May to September.

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Dybowskii’s brown frog (Rana dybowskii) 북방산개구리

by on Jun.01, 2010, under amphibian

Characteristics : Its body is 4~7cm long. It has irregular brown, deep brown or black spots on its back. It also has a black stripe around its eardrums, and spots on its nose. The distinct eardrums are usually round-shaped. Its body is thin and narrow, and protuberance is clear. Its nostrils lean to forward of its mouth and the side line is bended toward the eardrums. The size of eardrums is 2/3 or 3/4 of its eyes, and its web is well developed. A male is smaller than a female.

Ecology : When it lays eggs, you can see it in waterside but it lives in field or forest after laying eggs. It usually lays eggs on February to April but also on January in Jeju. It lays eggs in pond, puddle, riverside and valley.

Where you can see this species at Dongbaekdongsan : On egg-laying season, you can see adults which come to lay eggs and its eggs in the pond or marsh easily. And after that season, you can observe that it lives in a grazing land or forest.

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Japanese tree frog (Hyla japonica) (청개구리)

by on Jun.01, 2010, under amphibian

Characteristics : It is usually green on the back, and has deep green or dark brown irregular patterns in yellowish green background. A male has a big weeping pocket in the vicinity of pharynx but female doesn’t. The trunk is flat and slim. The size of an adult is about 2.5~4cm both in female and male. Suction cups are developed on toes.

Ecology : It lives in flat lands, shrub or on leaves except in breeding season. From April to July, it lays 400~800 eggs in pond, valley, pool and many places, and the eggs are divided to 20~30 in one place. The eggs are deep yellowish brown and the lower part of the eggs called vegetal pole is light colored.

Where you can see this species at Dongbaekdongsan : a pond, wetland or on the trees around wetland. You can easily find adults crying at a wetland around Monmulkak(먼물깍) especially in summer evening.

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