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Bakeneko or nekomata in Japanese folklore.
A cat may become a bakeneko by living to a certain age (some say longer than 10, others say 40 or 100 year).
The tail forks in two and the bakeneko is then called a Nekomata.
Bakeneko / Nekomata is said to walk on its hind legs, create ghostly fireballs, change its shape into a human and speak human language.