They are part of the Viperidae family, that includes vipers, rattlesnakes, and moccasins.
This family contains about 180 species of medium-sized highly venomous snakes (Serpentes) and are typically terrestrial, nocturnal, feed on small mammals, and a few species are arboreal or fossorial [adapted for digging or burrowing].
They reproduce via oviparous or ovoviviparous.
It is believed by some that Cleopatra was bitten several times by an asp when she committed suicide.2. Etymology: from old French aspe, "asp"; or directly from Latin aspidem, aspis which came from Greek aspis, "an asp, a snake".