A computer mouse is an input device which allows a user to move a pointer on the screen with their hand and to click on its buttons to select things on the screen. It is called a mouse because of its shape. It has a rounded body much like a rodent, and it has a long skinny cord, much like the tail of a live mouse.
To throw snowballs on Club Penguin you can press the, "t" button, then you will see your mouse change shape. After that click where you want to throw your snowball. Another way to do it is at the bottom of your club penguin screen, you'll see a blue bar. Look for a snowball. Then your mouse will change shape, click on the place where you want to throw a snowball. Answered by the Penguin: Jellyfish33