There are diffirent cats

Even with all the things similar between cats, there are ones which are diffirent from the others.

And like people there are diffirent characters. There are more playful or more passive kittties. There are social ones that look for interraction, and ones which are more closed. There's obdeient ones and troublemakers. Every cat has it's own character as well as a temperament  and diffirent intellegence.

This may be seen when you observe a group of cats, which makes their diffirences more obvious.