Which snakes use venom to kill?

Elapids (Cobras, Mambas, Kraits, Coral Snakes etc.), Atractaspidids (Burrowing Asps), Vipers (Pit Vipers, Rattlesnakes etc.), Hydrophiids (Sea Snakes) and a few members of the Colubrid family (Boomslang, Twig Snake, Brazilian Smooth Snake etc.).