What explores a silent blue world where every breath must be counted?

Many have me, but few think of me until it's time to pay. Solve the riddle → Which creature is perfectly named for its vocal talents, always ready for a performance? Solve the riddle → What goes up and down but never moves? Solve the riddle → What can silence an entire room with a single click, without uttering a sound itself? Solve the riddle → I drive things forward but have no movement of my own. Solve the riddle →