In disposition and mode of life these gulls differ much from each other. The glaucous gull is sufficiently strong to be able to defend its eggs and young against the attack of the mountain fox. It therefore breeds commonly on the summits of easily accessible small cliffs, hillocks or heaps of stones, preferably in the neighbourhood of "loomeries" or on fowl-islands, where the young of the neighbouring birds offer an opportunity for prey and hunting during the season when its own young are being fed. Sometimes, as for instance at Brandywine Bay on Spitzbergen, the glaucous gull breeds in great flocks on the ledges of steep fell-sides, right in the midst of Brünnich's
guillemots. On Bear Island I have seen it hatch on the very beach, at a place, for instance, under the arch of a waterfall leaping down from a precipitous cliff. The nests, which, to judge from the quantity of birds' dung in their neighbourhood, are used for a long succession of years, are placed in a depression in the rock or the ground, and lined with a little straw or a feather or two. The number of the eggs is three or four. After boiling they show a jellylike, half transparent white, and a reddish yellow, and are exceedingly delicious. The young birds have white flesh, resembling chicken. The burgomaster is common everywhere along the coasts of Novaya Zemlya and Spitzbergen. Yet I have not seen the nest of this gull on the north coast of North East Land or on the Seven Islands.
Still more common than the glaucous gull in the lands of the High North is kryckian, the kittiwake. It is met with far out at sea, where it accompanies the vessel whole days, circling round the tops of the masts, and sometimes—according to the statements of the walrus-hunters, when a storm is approaching—pecking at the points of the pendant. When the vessel is in harbour, the kittiwakes commonly gather round it to pick out anything eatable in the refuse that may be thrown away. They breed in great flocks on the steep escarpments in some separate part of the fowl-fells, in connection with which, it is evident that the kittiwakes always endeavour to choose the best places of the fell—those that are most inaccessible to the fox and are best protected against bad weather. Among the birds of the north the kittiwake is the best builder; for its nest is walled with straw and mud, and is very firm. It juts out like a great swallow's nest from the little ledge to which it is fixed. Projecting ends of straw are mostly bent in, so that the nest, with its regularly rounded form, has a very tidy appearance. The interior is further lined with a soft, carefully arranged layer of moss, grass and seaweed, on which the bird lays three to four well-flavoured eggs. The soft warm underlayer is, however, not without its inconvenience; for Dr. Stuxberg during the voyage of 1875 found in such a nest no fewer than twelve kinds of insects, among them Pulex vagabundus, Bohem. in nine specimens, a, beetle, a fly, &c.
The ivory gull, called by Fr. Martens "Rathsherr," the Councillor, is found, as its Swedish name indicates, principally out at sea in the pack, or in fjords filled with drift-ice. It is a true ice-bird, and, it may almost be said, scarcely a water-bird at all, for it is seldom seen swimming on the surface, and it can dive as little as its relatives, the glaucous gull and the kittiwake. In greed it competes with the fulmar. When any large animal has been killed among the drift-ice, the ivory gull seldom fails to put in an appearance in order to quench its hunger with flesh and blubber. It consumes at the same time the excrements of the seal and the walrus, on which account from three to five ivory gulls may often be seen sitting for a long time round a seal-hole, quiet and motionless, waiting patiently the arrival of the seal (Malmgren).
The proper breeding places of this bird scarcely appear to be yet known. So common as it is both on the coasts of Spitzbergen from the Seven Islands to South Cape and on the north coast of Novaya Zemlya and America, its nest has only been found twice, once in 1853 by McClintock at Cape Krabbe in North America in 77° 25' N.L., the second time by Dr. Malmgren at Murchison Bay, in 82° 2' N.L. The two nests that Malmgren found consisted of depressions, twenty-three to twenty-six centimetres in diameter, in a heap of loose gravel, on a ledge of a steeply-sloping limestone-rock wall. In each nest was found only one egg, which, on the 30th July, already contained a down-covered young bird. For all the ivory gulls which have their home on Spitzbergen there were doubtless required several hundred such breeding-places as that at Murchison Bay. When to this is added the fact that we never in autumn saw on Spitzbergen any full-grown young of this kind of gull, I assume that its proper breeding-place must be found farther north, on the shores of some still unknown Polar land, perhaps continually surrounded by ice. It deserves to be mentioned with reference to this, that Murchison Bay was covered with ice when Malmgren found the nests referred to above.