Are mummified remains of unidentified creature proof of the mythological Kappa?

In ancient Japanese folklore, the Kappa is a water demon that inhabits rivers and lakes and devours disobedient little children. While some believe the legend originated from sightings of the Japanese Giant Salamander, a species still alive today, others maintain that the myth is real and that an unusual set of mummified remains, showing a webbed hand and a foot, is proof that the Kappa exists. Now people will have the opportunity to see for themselves as the unusual body parts will go on display for the first time on the island of Kyuushuu in Japan.

The Kappa, a word meaning ‘river child’, is usually depicted with the body of a tortoise, a beak, and the limbs of a frog, and has a hollow filled with water on top of his head. While they are primarily water creatures, they are believed to occasionally venture onto land. According to legend, the cavity must be kept wet when the Kappa ventures out of the water, or he will lose his powers.