On the arrival of his mate a few days after himself, they set up housekeeping with little or no delay. The nest is a very delicate structure built low down in some bush, or in a clump of nettles on the outside of the hedge, it is composed of grass and bents lightly but strongly interwoven and lined with a few horsehairs, and though looking very fragile and thin, it serves its purpose well. The eggs, four to six in number, are of a yellowish-olive colour blotched and spotted, especially near the larger end, with purplish blue. The hen alone sits, while her mate warbles his song to relieve her tedium, or searches for insects and flies, which he continually brings her. The young are hatched in about eleven days, and in another fortnight are hopping about accompanied by their parents, who still tend them for a short time, till the cares of another family engross their attention. For the rest of the summer these birds may be found in small parties in woods, fields, furze, commons, or hedgerows, wherever cover is to be obtained, feeding on caterpillars, flies, and insects, of which there is an abundance at that time of year. In July and August they renew their worn plumage and become extremely fat, and then when the September equinox warns them that the best of the summer is past, they go southwards to the shores of the Mediterranean and to Africa, there to pass the winter till returning spring once more prompts them to risk the perils of the journey and to revisit their summer home. The male has the head and neck dark grey, mantle and wings brown with broad rufous edges to the secondaries. Tail feathers brown, except the outer pair that are white and the next pair that are tipped with white. Under parts white, fading to pale vinous on the breast and flanks. The female is duller and has the head brown; the young are rather more tawny. Length 5·5 in.; wing 2·8 in. This bird is common throughout the United Kingdom except the extreme North of Scotland. THE LESSER WHITETHROAT Sylvia curruca (Linnæus) [Illustration: LESSER WHITETHROAT _Sylvia curruca_]