We usually see these small salamander, but this one in Japan can bite you causing severe injuries. It’s skeleton is very dinosaur like and it can not move well on a shore and its stomach might get wounds if it has somehow ended up on dry shore. Picture on the left is very old(1887) illustration of this amphibian, and it’s color is mixture of green,black and brown.Very interesting inhabitant of the Japanese waters.
There is also other Giant salamanders in China , USA and others around Asia.
Here are some videos from YouTube: