They hibernate through the winter but are active around April whilst looking for mates. Adders can also be seen throughout the summer.
Despite people being very nervous of this snake, it is quite hard to see. Its zig zag pattern camouflages it incredibly well against bracken. Look out for it on sunny days basking in quiet areas of the site, and on warm rocky outcrops. Don’t approach them, as they are our only poisonous snake.
Unlike most reptiles, adders do not lay eggs. Young snakes are born about the size and shape of an earthworm and are a perfect miniature of the adult snake.