Flextone Bone Collector Bootie Call The Bootie Call is the only call that can make mews, chirps, and even estrus cries totally hands free. Simply bite down or release the reed under the rubber mouthpiece to raise or lower the pitch. Make numerous cow elk sounds while drawn back with your bow or holding steady with your gun. Appreciate the silence of the call if you accidentally bump it against your gun or bow. Be prepared for some close encounters.