An apparatus for automatically deterring pest with a light projection on the ground that is perceived as a predator by pests such as birds, which triggers a fear reaction from the birds to leave the area. The apparatus is designed to project a large beam of more than 60 mm diameter in visible light with sufficient power to be seen during daylight. The apparatus is adapted to pan and tilt continuously and randomly within specified limits that are programmed to project the beam in various areas and protect the areas from birds. The apparatus relies on a robotic arm or orientable support mounted on a frame that can be displaced or repositioned easily thanks to a forklift. Methods for activating and controlling the apparatus are also provided.