Insect ABC's
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Click beetles can grow to be about 1/4 to 3/4 inches long. On their underside they have a click mechanism that is used in defense aginst predators and getting them off their backs. The release of the mechanism is what makes the audible click, it can cause the beetle to be propelled a few inches into the air. They are a usually a brown colored beetle.

 

Photo Courtesy of: Marlin E. Rice. http://www.ent.iastate.edu/imagegal/coleoptera/click/3936.12clickbeetle.html

 

 

Source: http://www.ext.vt.edu/departments/entomology

/factsheets/clickbee.html