Which snake is the poisonous in Germany as well as in Europe.
There are only two poison keys in Germany: the cross swords and the aspisviper. From both, the poison is not dangerous for humans, but can cause an allergic reaction. The poisonous snake of Europe is the Hornviper.
This is the Hornviper in Europe
However, that does not exist in Germany of my knowledge.
In Germany, it is the cross dot.