Cats need to be taught to hunt. Any cat will chase things that are moving fast, but unless their mum tells them what things to kill and eat, and how to do it, they'll often stare stupidly instead of attacking.
There are exceptions to every rule, though, and I wouldn't encourage anyone to let Fluffy play with your pet gerbil. Unless you don't like the gerbil.
There are exceptions to every rule, though, and I wouldn't encourage anyone to let Fluffy play with your pet gerbil. Unless you don't like the gerbil.