Hog grunts are made by both boars and sows. The grunts of a wild hog sound very much like those of a domestic pig. Because of the wild hog's strong pack instinct and its curious nature, they will often investigate the sounds of other hogs. Features: Flexible hose for variable tones Reproduces the grunting sounds of boars and sows Appeals to the pack instinct of a hog Extra loud for long range or softer when they're close U.S. Patent No. 5,910,039