Dear WW: Rattlesnakes have fangs as part of a parallelogram of bones that collapse
flat when mouth is closed, but erect the fang when mouth is open. Rattlesnakes basically
stab with long fangs which point ahead when mouth is open. Coral snakes have to chew
on you to get poison into wound.

A long time ago reading about Panama Canal I saw "Culebra Cut" . Thanks, Faldage.

And anguine means just snakelike.