Another word for viper

There are several snakes, including the viper (Pelias berus).

The reptiles include the ringed-snake, slow-worm, viper and lizard.

Of serpents there are only two poisonous kinds, the common viper and the adder (Kreuzotter).

But some were essentially indigenous, and he observed a singular character given to the fauna by the presence of certain Eastern forms, unknown in other parts of Persia, such as the tiger, a remarkable deer of the IndoMalayan group, allied to Cervus axis, and a pit viper (Halys).

Miillenhoff, "Viper Herkunft and Sprache der Pontischen Skythen and Sarmaten," in Monatsber.