Individuals of this species are to be found dispersed over all our seas, in small parties or singly, during the interval between the breeding seasons. In estuaries, bays, and narrows, where herrings or other fry are abundant, they congregate in vast numbers, along with Auks, Red-throated Divers, and Gulls of various species. About the end of April great quantities may be seen flying in strings along the coast towards their favourite haunts, which are the precipitous cliffs of Flamborough Head, the Farn Islands, St. Abb's Head, and other well-known spots on the English and Scottish sea-board. No preparation is made for the reception of the eggs, which are deposited in hollows of the rocks and ledges of the cliffs, each female laying a single one, although a great number are often seen so closely packed together as to be possibly covered by one bird. Where the cliffs are lofty and other birds breed with them, the Guillemot occupies a zone above the Kittiwake and below the Razor-bill. "It is interesting," writes McGillivray, with the enthusiasm of one who has tried it, "to visit one of the great breeding-places, to row along the foot of the cliffs in a boat, or to stand on a near promontory, and see the multitudes perched on the rocks, or flying out to sea or returning; or to look out from the summit upon the groups in sight; or startle from their stations a whole flock by letting down a large stone; or to descend by some crevice, clinging with fingers and unshod feet to the little narrow ledges, and creep in among the eggs; or to be let down, dangling on a rope, half trembling between fear and excitement." CHAPTER II. DUCKS, GEESE, SWANS, AND PELICANS. Willoughby distributes the Palmipedes into such as have the back toe, and those in which it is absent; the former, again, into such as have the four toes webbed together, and such as have the back toe separated from the others. These latter he again subdivides into narrow-billed and broad-billed; the former having their bills either hooked at the end or straight and sharp-pointed. The hook-billed have them either even or toothed on the sides. Those which have them straight or sharp-pointed are either short-winged and divers--such as Doukers and Loons--or long-winged, such as Gulls. The broad-billed are divided into Ducks and Geese. The Ducks are either Sea or Pond Ducks. "The Ducks," he adds, "have shorter necks and larger feet, in proportion to their bodies, than Geese. Howbeit, the biggest in this kind do equal, if not exceed, the least in that. They have shorter legs than Geese, and situated more backward, so that they go waddling; a broader and flatter back, and so a more compressed body; and, lastly, a broader and flatter bill. Their tongue is pectinated, or toothed, on each side, which is common with them and the Geese."