Arizonans should know not all rattlesnakes shake

James Gregg

Silent Rattlesnakes

In this July 15, 2010 photo, Kenny, a 4-foot long western diamondback rescued from a neighbor's porch by United States Geological Survey herpetologist Cecil Schwalbe, is photographed near Schwalbe's home in Tucson, Ariz. Schwalbe keeps the snake for scientific demonstrations, and for display at professional lectures. (AP Photo/Arizona Daily Star, James Gregg) ** MANDATORY CREDIT **