21.   The snap is a sharp clicking sound made with the tongue, and the sound carries almost as well as a whistle.

22.   They make rapid clicking sounds as a form of echolocation, or sonar, to help them navigate and detect prey.

23.   They were later given a sham treatment in which the magnet was held over their head and made clicking sounds but no field was emitted.

24.   Up a narrow, twisting flight of stairs, he emerged into a courtyard surrounded by rooms filled with the soft clicking sound of lapidaries at work.

25.   When he approached the pick-up truck, the clicking sounds came as two passengers quickly ejected shells from their shotguns.

26.   When set to intermittent mode, the wipers make a disconcerting clicking sound each time they sweep.

27.   You get to know a grackle by its clicking sound.

28.   Players slap the tiles down with a characteristic clicking sound.

29.   Her coach, Don Rabska, said she had to work to distinguish the clicking sound her bow made from the clicking cameras.

30.   Sperm whales emit a clicking sound that zips through the water and bounces off an object.