These birds are constant residents on the shores of Great Britain, changing their locality, however, according to the varying seasons of the year. The principal breeding-places are, Lundy Island, the Skellig Isles on the coast of Kerry; and in Scotland, the Isle of Ailsa, St. Kilda, Souliskerry (Orkney), and the Bass Rock in the Firth of Forth. This latter rock, where Macgillivray made some observations which we will detail, is about a mile in circumference, and of an oblong form, with precipitous cliffs, in some places perpendicular, and in others overhanging, except in one narrow part, where a less abrupt projection forms the only landing-place. "The Gannets arrive about the middle of February or the beginning of March, and depart in October; some years, a few individuals remain during winter. The nests are composed of grass and seaweed, generally placed on the bare rock or earth elevated in the form of a truncated cone, of which the base is about twenty inches in diameter, with a shallow terminal cavity. On the summit of the island are numerous holes in the turf, formed by the Gannets in pulling away grass and turf for their nests; these are placed in all parts of the rock where a convenient spot occurs, but are much more numerous towards the summit. Some of them, which have been occupied for years on the face of the cliff, or in a shallow fissure, are piled up to the height of from three to five feet; but in this case they always lean against the rock. The egg, which is solitary and presents nothing remarkable in its position, is of an elongated oval form, white, dull, with a chalky surface, usually sullied or patched with yellowish brown dirt. It is subjected to rough usage, for the bird when alighting, flying off, or disturbed by the intrusion of human visitors, tosses it about, and often stands upon it. All the movements of the Gannets on land are very awkward; it hobbles or waddles when it tries to walk, stares at you with its white goggle eyes, opens its ugly black throat, and emits a torrent of crackling sounds.