"Original Tarantula Azul" is the brand name of a tequila. It is tequila and the finest natural citrus liqueur. (according to the label). It is light blue in color and has its own unique flavor. When the Original Tarantula Azul Margarita mix(which is also blue in color) and blue curacao is mixed in with it, the drink is a very pretty dark blue. It has a different taste than "regular" margaritas and is quite tasty.