Trunks of trees, holes in walls and banks made by rats, moles, or mice, are selected for incubation purposes by this little bird. The nest is built of moss, wool, and hair, and contains from five to eight, or even nine eggs, white, spotted and freckled with light red or red-brown. THE GUILLEMOT. The Guillemot makes no nest at all, but deposits its single egg on the ledges of sea-cliffs in a great many places round our coasts. A verbal description of it is almost useless, as the colouring presents such a wonderful variety of tints. The ground colours are white, cream, yellowish-green, blue, reddish-brown, pea-green, purplish-brown, &c. Some are profusely spotted and blotched or streaked with black, black-brown, or grey in great variety; whilst others are scarcely marked at all. Our illustration may be taken as a very good specimen of one kind of colouring and marking, though a very pretty one might be given of an entirely different colour and character. [Illustration: EGGS. 1. Guillemot. 2. Rock Dove. 3. Dotterel. 4. Marsh Tit. 5. Little Auk. 6. Red-Legged Partridge. 7. Sanderling. 8. Long-tailed Titmouse. 9. Razor-bill. ] THE ROCK DOVE. Ledges and fissures or crevices in sea-cliffs are the nesting-places of this bird, which uses sticks, twigs, heath, and dead grass for building purposes. Her eggs are two in number, quite white. THE DOTTEREL. Mountain-tops in the North of Scotland are the favourite nesting-places of the Dotterel, which is now becoming comparatively rare in districts where it was once common. It uses no materials for nest-making, simply laying three eggs in a slight cavity amongst woolly-fringe moss or other mountain vegetation which affords some little concealment. The eggs are of a dark cream or olivaceous-brown colour thickly blotched or spotted with dark brown or brownish-black. THE MARSH TIT. Holes in trees (generally willows or pollards), banks, &c., are the places adopted by the Marsh Tit for its nest, which is composed of moss, wool, and down from rabbits, or the ripe catkins of willows. Her eggs number from six to eight, or even as many as ten have been found. They are white, spotted with red-brown, more thickly at the larger end. THE LITTLE AUK. The rocky shores of Spitzbergen, Greenland, and Iceland form suitable breeding resorts for this bird, which makes no nest, but deposits its single egg on the bare ground in some crevice or under loose rocks. The egg is of a pale greenish-blue, or white tinged with greenish-blue, a little spotted and veined, especially at the larger end, with rust-colour or yellowish-brown. Sometimes the egg has no spots or streaks, at others only indistinctly streaked or veined at the large end. THE RED-LEGGED PARTRIDGE.