XXXX - Japan
A water-dweller resembling a scaly monkey with webbed hands, a kappa will grab and strangle waders in its pond (PA8). According to Snape, the kappa is commonly found in Mongolia (PA9), but the Care of Magical Creatures textbook states that the kappa is a Japanese creature (FB).
Kappas are water sprites from Japanese folklore. They are said to have bowl-like depressions on the tops of their heads and they keep these filled with water. This is the source of their strength. To overcome a kappa, according to folklore, one must bow to it, enticing it to bow in return and spill the water from its head. (The Lexicon page 172).
A carnivorous, shape-shifting water creature (FB). Lockhart once gave Hagrid unsolicited advice on how to get kelpies out of a well (CS7). The world's biggest and most famous kelpie is the Loch Ness Monster, which is known to give Wizarding authorities some trouble because of it tends to be a bit of a show-off (DP1).
In Celtic folklore, the kelpie is a shape-shifting horse which haunts the lochs and rivers. A kelpie looks like a lost pony with a perpetually dripping mane. According to some legends, the kelpie will lure humans into the water to kill and eat them. (The Lexicon page 172).
XXX - pronounced NEE-zul
This very intelligent cat-like creature can detect unsavory or suspicious persons very well and will react badly to them. However, if a kneazle takes a liking to a witch or wizard, it makes an excellent pet. The kneazle has spotted fur, large ears, and a lion-like tail (FB). Crookshanks is part kneazle (Nr, JKR).