Is it poisonous?

Exploring Sweden’s Venomous Snakes: Meet the Deadly Adder



Sweden is home to a variety of snakes, some of which are venomous. Among these venomous snakes, the adder (Vipera berus) holds a prominent place. With its distinct features and potent venom, the adder is a fascinating species that deserves our attention.

Appearance and Characteristics

The adder is a relatively small snake, with females growing up to 60 centimeters in length and males slightly smaller. It has a distinguishable zigzag pattern along its back, which helps it blend into its natural habitat. The coloration of adders varies between individuals, ranging from grayish-brown to reddish or even black. They have a triangular-shaped head and vertical pupils, which are characteristics commonly associated with venomous snakes.

Habitat and Distribution

Adders can be found in various habitats throughout Sweden, including forests, meadows, moorlands, and rocky areas. They prefer environments with abundant vegetation and places to hide, such as shrubs, grassy fields, and fallen logs. Adders are widespread across Europe, and in Sweden, they can be found in almost every region, except for the most northern areas.

Venom and Predation

The adder possesses venom that it uses for hunting and self-defense. Its venom is a complex mixture of proteins and enzymes that can cause tissue damage and blood clotting in its prey. Although the venom is potent, adders are not aggressive snakes and will only bite if they feel threatened or provoked. The venom is primarily used to immobilize small mammals and birds, which make up the majority of their diet.

Interaction with Humans

While adders can deliver a venomous bite, they pose little threat to humans if left undisturbed. Most adder bites occur when people accidentally step on them while walking in snake-inhabited areas. If bitten, it is important to seek medical attention immediately, as untreated bites can lead to complications. In Sweden, adders are a protected species, and it is illegal to harm or kill them.


The deadly adder is a remarkable snake species that plays an important role in Sweden’s ecosystem. Despite its venomous nature, it serves as a valuable predator in maintaining the balance of local wildlife populations. By understanding and respecting these fascinating creatures, we can coexist with them in harmony.

Frequently Asked Questions

1. Are all snakes in Sweden venomous?

No, not all snakes in Sweden are venomous. The adder is the only venomous snake species found in Sweden.

2. How can I identify an adder?

Adders have a zigzag pattern along their back and a triangular-shaped head. They also have vertical pupils, which are distinctive features of venomous snakes.

3. What should I do if I encounter an adder?

If you encounter an adder, it is best to observe it from a safe distance and avoid disturbing or provoking it. Keep in mind that adders are protected species in Sweden, and it is illegal to harm or kill them.

4. Are adder bites fatal?

Adder bites can be serious, but fatalities are rare, especially with prompt medical treatment. If you are bitten by an adder, seek medical attention immediately.

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