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Forward-looking infrared (FLIR) cameras detect infrared, or thermal (heat) radiation, emitted from a heat source, and then put together a video image with the assembled data. The heat source could be something like an engine, a fire, or a warm body. In search and rescue, this means that as long as there is a living body emitting heat, the infrared camera will pick up the image, night or day, allowing operators to spot the person in distress. This also means that infrared cameras would be less useful in picking one person out of a crowd, in which case a zoom camera would be the tool of choice. In cases, for instance, of missing hikers, where large areas of territory need to be covered in the search and rescue operation, animal bodies emitting heat could be a potential confounding factor. However, most infrared cameras produce a clear enough image, usually aided by digital image processing, to give a fairly accurate idea of the shape of the body in view. A 4K camera and an infrared camera would commonly both be installed on a search and rescue drone, to allow the operators to select the most useful tool in a given situation.