Gulls, popularly speaking, are inseparably associated with the sea, yet the haunts of many species, especially during the breeding season, are by no means exclusively marine ones. Almost every kind of coast is frequented by these birds—rocky headlands, precipitous downs, sandy dunes, mud-flats or slob-lands, and marshes; whilst every harbour round the shore of our islands is periodically visited. Gulls are not very pronounced migrants. They wander about a good deal during the non-breeding season, and many Arctic species draw southwards during winter, but all the indigenous British forms are residents on and off the coasts throughout the year. With these few words of introduction we will now proceed to give a more detailed account of the strictly British species. GREAT BLACK-BACKED GULL. This, the largest of the Gulls, and scientifically known as _Larus marinus_, is one of the least common British species, most locally distributed during the breeding season. It is not known to breed anywhere on the east coast of England, and but very locally on the south coast, in Dorset. It becomes more numerous in the wilder districts, in Cornwall, the Scilly Islands, and Lundy, and thence locally along the Welsh coast and in the Solway district. In Scotland it becomes more common, especially among the islands of the west coast, including St. Kilda, and on the north coast to the Orkneys and Shetlands. It is also widely distributed in Ireland, but there, as everywhere else, extremely local, and nowhere, comparatively speaking, numerous. During the non-breeding season it wanders more, and is then seen at many places along the coast. I have seen as many as fifty of these fine birds in Tor Bay, after heavy gales from the eastward. Montagu asserts that this Gull is locally known as a “Cob,” but the term is of pretty general application to the larger Gulls, and, so far as I can learn, has no distinctive significance. In St. Kilda, where I had many opportunities of studying the habits of this Gull, it is regarded with hatred by the natives, owing to its depredations amongst the eggs of the other sea-fowl. In this island it is universally known by the name of “Farspach.” No Gull is more wary, and yet on occasion none are bolder and more daring. I have seen a bird of this species tear to pieces a Puffin I had shot as it floated upon the sea, and that in spite of several shots I had at it with a rifle. It is a sad robber of the other and more weakly Gulls, not only pillaging their nests at every opportunity, but chasing them, and making them relinquish bits of food they may chance to pick up within view. Like the Raven and the Crow, it seems fully conscious of its marauding misdeeds, and correspondingly artful, as if always instinctively fearing that treatment it metes out so lavishly to creatures more helpless than itself.