This 3-pack also doubles as great, SpringGobbler locator calls! As with people,coyotes have voices that differ with sexand age. This family pack, will enable youto make all the different sounds a pack ofcoyotes may make. This is done by varyingthe thickness of the reed and in theconfiguration of the sound chambers. Thecall with the horn will be the coarser male.The call with the tube covers females andthe plain sound chamber will be the higherpitched juveniles.