Ive called more birds in using a mouth call. Maybe thats just me but ive seen birds in fields hens included who wouldnt respond to a box or a slate call. The second i use the mouth call heads go up and they are searching for me. Not to say that box or slate calls dont work because they do. Just my experience has been i get a more realistic sound from a mouth call. Again that is just me and obviously experiences differ. But back on topic she is gettin better at it and has also gotten herself to try some slates out!