How do you know a turtle is angry?

If the cat swishes its tail very sharply from side to side, the cat is mad! When relaxed they swish their tail much more gently from side to side. The cat might growl or stare at you, it depends on how mad you've made it. The most common thing a cat would do is swish its tail. If you continue to get on the cats nerves they may bite or bat you with their paw.