. . . "Mental groove"@en . . . . . "814"^^ . . . . "Most snakes have a longitudinal groove on the underside of the head between large, paired chin shields and smaller gular scales. This is referred to as Mental groove."@en . . . . . . . "1105890804"^^ . . . "Most snakes have a longitudinal groove on the underside of the head between large, paired chin shields and smaller gular scales. This is referred to as Mental groove."@en . . "11973067"^^ .