Adder

**Adder (Vipera berus)** The adder is Europe's only venomous snake, distinguished by its characteristic dark zigzag pattern running along its back and distinctive V or X-shaped marking on its head. Adults typically measure 60-90 centimeters in length, with females generally larger than males. These reptiles are ambush predators, feeding primarily on small mammals, birds, lizards, and amphibians. Their venom, delivered through hollow fangs, immobilizes prey and aids digestion. As both predator and prey, adders play a crucial role in maintaining ecosystem balance. Adders have the widest geographic distribution of any terrestrial snake, ranging across Europe and into Asia, from Britain to the Pacific coast and north into the Arctic Circle. They inhabit diverse terrestrial environments including heathlands, moorlands, woodland edges, coastal dunes, and mountainous regions up to 3,000 meters elevation. These cold-adapted snakes hibernate for 4-7 months annually, often communally in underground refugia. *Note: The IUCN status listed as "CR" (Critically Endangered) appears inconsistent with the species' actual global conservation status, which is typically assessed as Least Concern globally, though regional populations face varying degrees of threat.* Habitat fragmentation and loss represent primary threats to local populations, particularly in densely populated regions. Agricultural intensification, urban development, and deliberate persecution further impact numbers. Climate change affects hibernation patterns and prey availability. Conservation efforts include habitat restoration, wildlife corridor creation, and public education programs to reduce persecution. Several countries have implemented legal protection measures. The species' wide distribution suggests overall stability, though many regional populations continue declining due to ongoing habitat pressures and human encroachment.