Abstract: The device comprises a housing featuring a transparent window behind which is positioned an infrared detector. A disc in the same plane as that of the front face of the housing can rotate around its central axis perpendicular to said plane. The visible side of the disc shows a pattern of a color in contrast with that of the disc, such as black over white background or vice-versa. If the infrared detector signals the presence of a heat-emitting source, such as the one given out by the body of a bird on a surface to be protected, a dissuasive process for birds is activated which combines disc rotation and sound emission. The disc rotation creates the illusion of the presence of the eye of a bird of prey, while the sound emission includes cries like those of birds in distress, or cries or a feared bird of prey.

Abstract: A preventative device against nuisance from birds comprised of a base to which spikes are fitted vertically on the side opposite surfaces of a structure to be protected in order to discourage birds from landing on those surfaces. The base is provided with canals, and each spike has a protuberance obtained by flattening the material of which it is made. The protuberance is slightly larger than the cross section of the canals. The spikes are force fit into the canals so as to be held firmly therein. In an embodiment of the invention, the base of the device is made from polymethylmethacrylate. In another embodiment, the adhesive used to secure the base to the surface being protected is a neutral silicone adhesive.