Bird caps, which are devices installed at the highest elevations of the peaks of gabled roofs so as to prevent damage caused by the roosting habits of birds. Exemplary bird caps of the invention each comprise a peak formed by angularly connected side panels, opposed and adjustable face panels that may be moved apart or together to adjust the angle at the peak, a tail portion and a tail plate, each of which provides a further covering function to the area around a roof peak. In certain embodiments, the device includes hooded panels which further enhance the roof peak protection provided. Also disclosed are methods of preventing the bird damage and deterioration at the peak edges of a roof.
