I couldn’t resist passing on something I read about the CIA during the Vietnam War. Evidently, in the 1960s and 1970s the Indochinese tiger population in Veitnam was robust. The Agency needed a way to track VietCong and the NVA. They came up with a seismic detection device that would identify troop movements. The problem though was how to disguise something that was not native to the surroundings but wouldn’t be noticed, or at least scrutinized.
The detection device was designed to look like tiger droppings.