What dangerous attribute separates the Family Viperidae, housing Crotalus atrox, from families like Colubridae?

Answer

Venom delivery via specialized, hinged fangs.

The defining feature of the Family Viperidae, which places the Western Diamondback Rattlesnake here, is its mechanism for venom delivery. Viperids possess specialized fangs that are hinged, allowing them to fold back against the roof of the mouth when not in use and swing forward for injection. This contrasts sharply with the Elapidae family (like cobras), which possess fixed front fangs, and many snakes in the Colubridae family, which are generally non-venomous or utilize different delivery systems.

What dangerous attribute separates the Family Viperidae, housing Crotalus atrox, from families like Colubridae?
animalclassificationreptilesnakeRattlesnake