A "trail camera" is usually a digital camera in a rugged box with an infrared sensor that is ran off of batteries and is automatically triggered by motion in front of it. Hunters will often use trail cameras so that they can leave the camera in a spot where they think their prey might be and then come back later to review the images to confirm. The flip side is also, people who work on saving animals use them to help identify how many animals are in an area and what types they are. A couple using a trail camera on their property caught what they believe is a UFO hovering over deer. The pictures they captured certainly are curious; if it was a vehicle causing the light then how did they get about 20 feet off the ground? If it was an airborne vehicle, then what kind of vehicle can hover like that and has lights that resemble the headlights of a vehicle? All I know is if that was my backyard I would be darn curious!