Various reasons! They will be playing, thinking they are
hunting or practicing hunting. They will be hyperactive and just
bite at any random moving object. They could be teething. They also
could be attacking for protection of owners, kittens, "other
relative of the cat." They could even be hungry and smell whatever
you ate last on your hands. Cats are a mystery but that is the most
likely situations I can think of out of my many years of owning
Cats bite in self defence or if they think your being annoying to them. All animals bites we cant stop that. Cats also bite people because they sometimes aren't in the mood for being adored.