Of all March’s attractions, none enthralls me more than Britain’s sole venomous reptile, the Adder. Even the weakest late-winter sun conveys sufficient solar energy to entice male snakes out of their underground ‘hibernacula’ and they are poised to mate the moment females emerge. Unfortunately, Adders are in trouble, with populations declining and disappearing. Your best chance to see them is on an early-morning visit to heathland or chalk downland. Check sheltered, south-facing banks.