"This is the time of year when it is easiest to spot them (adders) as they emerge from hibernation" (The Herald, May 13). Here, adders first emerged in early March and continued to appear throughout the month, though fairly infrequently, as the weather was poor. In April they could be seen in greater numbers and more regularly. Despite the good weather, they have disappeared over the past week. This is not the best time to observe them.

Michael Mitchell, Kirkokerry Millhouse, Tighnabruaich.