The head of a Buff-Tip moth Phalera bucephala.  When settled, this attractive and highly camouflaged moth has the remarkable appearance of a freshly broken twig with silver grey 'bark'.  The species is found in Britain and throughout Europe in deciduous woodland and farmland areas.  The moth is on the wing between May and July while the caterpillars appear during July and August, feeding on a variety of tree leaves including willows, oaks and hazels.  They pupate under the ground and spend the winter in this stage before emerging as adults during the following Spring.