Look out for adders when next you visit Glen Tanar. The warm weather has brought them out, so you are very likely to see one, basking in the sun, or scurrying away.
And yes, they do bite: but only if provoked: so don't sit on them, and keep your dog to heel.
The picture shows its markings(click on it to enlarge), the zig-zag down its back, but colours do vary.
