i beleive jabba was had one of these in his possesion take a look at this http://www.starwarz.com/tbone/cut_scenes/trash_compactor/rancor_vs_krayt.htm it may not be cannon but in the cross section book inside the worlds of the star wars trilogy in jabbas palace you can see one and in boba fett 5 there is an arkanian with one in the palace