Hero Guy heroically sent this in.
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When the CIA's secret gadget-makers invented a listening device for the Asian jungles, they disguised it so the enemy wouldn't be tempted to pick it up and examine it: The device looked like tiger droppings.

The guise worked. Who would touch such a thing? The fist-sized, brown transmitter detected troop movements along the trails [1] during fighting in Vietnam, a quiet success for a little-known group of researchers inside the world's premier intelligence agency.