オオサンショウウオ
The Japanese giant salamander is restricted to streams with clear, cool water. Due to its large size and lack of gills, it is confined to flowing water where oxygen is abundant. it is entirely aquatic and almost entirely nocturnal. Unlike other salamanders, which lose their gills early in their lifecycles, it only breaches its head above the surface to obtain air without venturing out of the water and onto land. The salamander absorbs oxygen through its skin, which has many folds to increase surface area.