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A clicker, sometimes called a cricket, [1] is any device that makes a clicking sound, usually when deliberately activated by its user.
They usually consist of a piece of thin metal or plastic held in a casing so that the metal is slightly torqued; depressing one end of the metal causes it to pop out of alignment and releasing it causes it to pop back into alignment, each time making a sharp click.
With some clickers, the user depresses the metal directly with thumb or finger; with others, a button extends above the surface of the casing so that depressing the button makes the metal click.
"The clickers were dime store crickets that made a nice, loud click, perfect for signaling a First Communion class so all the kids would stand up at the same time, and kneel at the same time, and start filing down the aisle together." [7] — Roger Ebert
Clickers were first used by marine mammal trainer Karen Pryor as a way of communicating with their animals. Dolphins and whales communicate underwater through a series of clicks and whistles known as echolocation, and the clicker allowed a trainer to produce signals they were more likely to understand.[ citation needed ]
Clickers are now used to train dogs, and other animals. When associated with a treat, a click allows the owner to mark the precise moment the desired behavior is executed.[ citation needed ]