Habitat: Heathlands, meadows, woodland, hedgerows, lowland calcareous grassland and dune heath.
Size: Length 60 cm (24 in).
Food: Small mammals, birds, lizards, amphibians and slow worms.
Season: All year round.
IUCN Conservation Status: Least Concern
Adders are not usually aggressive, tending to be rather timid and biting only when cornered or alarmed. The venom toxicity is relatively low however there have been fatalities.