What specialized weapon system fundamentally distinguishes the Viperidae family?

Answer

A pair of long, hinged, hollow fangs attached to a movable maxillary bone

The defining characteristic of the Viperidae family is their specialized dentition, known as solenoglyphous, where long, hollow fangs are hinged and folded back against the roof of the mouth when not striking.

What specialized weapon system fundamentally distinguishes the Viperidae family?
classificationreptilesnakeviper