A kitten (Old English diminutive of cat)'s a juvenile domesticated cat (Felis catus) that isn't yet fully-grown. The young of big cats are called cubs rather than kittens. Either term may be used for the young of smaller wild felids such as ocelots, caracals, and lynx, but "kitten"'s usually more common for these species. Though the term primarily refers to young cats, it can also be used when talking about the young of beavers, hedgehogs, rabbits, rats, skunks and squirrels. Birth and develop… (More on Kitten)