The Willow Wren is closely allied to the Chiffchaff and so like it in general appearance as to need a critical examination, when dead, to enable it to be recognised. In habits also there is little difference to be noted. Its range is more extensive, for as far north as the birch woods extend, this hardy little wanderer makes his home, retiring at the end of summer to Southern Europe and Africa. Throughout our islands it is extremely common. Arriving about the last week of March, it at once makes its presence known by its bright little song, which is very short and somewhat resembles the Chaffinch’s; it is repeated again and again, and may be heard right through the summer and sometimes again after the moult in the late autumn, just before their final departure. The nest is similar in size, shape, and materials to that of the Chiffchaff, but differs in its position, being generally placed very near and often right on the ground, always well concealed in the undergrowth, whereas with the Chiffchaff it is always off the ground, sometimes only an inch or two, but more often some eighteen inches or two feet. The eggs are white with pale rufous spots; these markings are much paler than on those of the Chiffchaff, less clean cut, and more numerous. Apart, however, from the breeding birds, an enormous number of Willow Wrens pass through this country at migration time. England seems to lie in the main track of these birds when they are making for their summer quarters in higher latitudes. From early April to the middle or end of May they simply pour through this country in incredible numbers. The whole extent of the south coast is involved, and often for several days at a time they arrive in millions. These birds pass straight on, relentlessly pursuing their course, and having crossed the Channel one night, prepare during the following day for a still longer journey across the North Sea during the coming night. Early in August the return journey commences, and in still greater numbers they steadily pass southwards, till by October they are, let us hope, enjoying peace and plenty under sunny skies. Extremely like the Chiffchaff, but rather larger, brighter in colour, and with paler legs. Its distinctive characteristics have been noted under the preceding species. Length 4·9 in.; wing 2·7 in. THE WOOD WREN Phylloscopus sibilatrix (Bechstein) Although a member of the same family as the last two species, this bird is much more local. It is not until the end of April that he reaches our shores and his clear and melodious little song, which may be syllabled as “chit, chit, chit, chit, tri-tr-tr-tre,” can be heard. His favourite haunts are suitable woods where large timber, especially beech, abound. Here he may be seen as, with the restless activity so characteristic of his family, he searches among the upper branches of the trees for those insects which, with berries of all kinds, form his staple food.