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Bornean flat-headed frog
The Bornean flat-headed frog (''Barbourula kalimantanensis'') is a species of frog in the Bombinatoridae family. Although many salamanders are lungless, the Bornean flat-headed frog is the first frog known to have no lungs.〔
Djoko Iskandar, an Indonesian zoologist, first described the Bornean flat-headed frog based on a single specimen. However, he did not know the frog was lungless until he was in the field with David Bickford's expedition. Bickford ''et al.'' were able to dissect some of the specimens and discovered for the first time that the frogs had no lungs. The frog breathes entirely through its skin, and its internal organs (the stomach, spleen and the liver) take up much of the space which normally would be filled by the lungs. By retaining the lunglessness of their tadpole stage, the frogs are much flatter than typical frogs, which might help absorb oxygen and avoid being swept away in fast streams.
==Description==
This frog grows to a snout-to-vent length of for females and males are slightly smaller. It has a dorsoventrally flattened body with a broad head with a rounded snout. The limbs are robust and both hands and feet are fully webbed. The dorsal skin is smooth with small tubercles on the posterior end and the hind legs and the ventral skin is smooth. Its general colour is brown with black mottling.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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