European Vipers are a group of venomous snakes found in Europe. They include the adder, which is the only venomous snake native to Britain and Ireland. These snakes have a wide range of habitats, from woodlands to grasslands, and can be found in many countries across Europe. They are usually small in size, with a length of up to 60 cm, and have a distinctive zig-zag pattern on their backs. They are also known for their potent venom, which can cause serious injury or even death if not treated quickly.