Although no device is foolproof, several have worked well in many situations. The Gardeneer Inflatable Snake has been judged as particularly effective except in areas where snakes do not live naturally (e.g. Pacific Northwest). The Inflatable Owl is a less expensive alternative to the hard-bodied Great Horned Owl and is also quite effective. The Guard ‘N Eyes balloon with large eyes all around has been judged very effective and works because research has determined that the eyes of the owl are the most recognized feature of the owl and even if used alone, are still frightening. Less effective, but still useful is reflective Holographic Tape that can work for a time, being stretched over a row of fruits or vegetables and give the illusion of something continually moving in that area. One or two twists in the tape cause a whipping back-and-forth motion in the breeze that is particularly effective.