The common adder, also known as Vipera berus, is a venomous snake found across Europe and parts of Asia. It is easily recognizable by its distinctive zigzag pattern along its back, which can vary in color from brown to gray. Common adders are typically around 60 to 90 centimeters long and are known for their relatively mild venom, which is rarely fatal to humans. These snakes prefer habitats such as heathlands, woodlands, and grasslands, where they can bask in the sun and hunt for small mammals, birds, and amphibians. Common adders are ovoviviparous, meaning they give birth to live young rather than laying eggs. They are an important part of their ecosystem, helping to control rodent populations.