Kappa are legendary creatures; a type of water sprite found in Japanese folklore. However they are also considered to be a part of Cryptozoology, due to claims of sightings. It could be the Japanese giant salamander.
JAPAN's_Suiko: Suiko are found in both China and Japan and are often confused with kappa, which they closely resemble. However, suiko are far more dangerous, violent, and hot-tempered than their kappa cousins.