Latin name: Vipera berus
The adder is the only British venomous snake. The adder may be seen on heathland basking in sheltered sunny South facing places on a mild and sunny day after rain between March and the beginning of October.
Nationally, adders have a localised distribution throughout England, Wales and Scotland on heathland habitats. In the Yorkshire Dales National Park there are large areas of suitable habitat but a shortage of trained surveyors. It has been formally recorded in Coverdale and the South East of the Park but it is likely to be more widespread. In 2010, the adder became a Yorkshire Dales National Park priority species. Since then the wildlife conservation team of the Yorkshire Dales National Park Authority has been working with local volunteers to assist with the National Amphibian and Reptile Recording Scheme (NARRS). In 2012, an integrated habitat network analysis for adder carried out by the National Park Authority highlighted a number of specific areas of high potential for this species.