Kappa

The Kappa is a Japanese water demon that lives in ponds and shallow rivers. The Kappa resembles a monkey, but it is covered in fish scales. The Kappa's distinctive feature is the hollow on the top of its head that is filled with water. If the Kappa somehow loses the water from the hollow in its head, it loses all its strength.

Kappas are fond of Human blood, but can be persuaded not to attack a person if thrown a cucumber with the person's name carved on it. In confrontations with a Kappa, Wizards try to trick the creature into bowing in an effort to make the Kappa spill the water in its hollow.

Appearances

 * Fantastic Beasts and Where to Find Them