It is a master of stealth, stretching less than half an inch long and weighing in at 2.5 milligrams with as estimated air speed of 1 to 1.5 miles per hour. It is virtually soundless in flight, registering zero decibels from ten feet. Its tracking systems hone in on targets by detecting infrared radiation from warm bodies, chemicals such as carbon dioxide and lactic acid, body odors from as far as a hundred feet, as well as movement from fidgety hosts.
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