This 3 — pack also doubles as great, Spring Gobbler locator calls! As with people, coyotes have voices that differ with sex and age. This family pack, will enable you to make all the different sounds a pack of coyotes may make. This is done by varying the thickness of the reed and in the configuration of the sound chambers. The call with the horn will be the coarser male. The call with the tube covers females and the plain sound chamber will be the higher pitched juveniles.