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 arrived flies away, and, on returning again, brings nothing. Sometimes a gull may be seen walking with moss or heather in the bill, whilst its consort walks beside it, but without having anything. When the heather is placed by the one bird, the other stands by and seems interested, but does not assist, and no further supply is brought. It would appear, therefore, that only one bird—and this, no doubt, the female—actually builds the nest, though the other—the male—may look on and take a greater or less amount of intelligent interest in what she is doing. But though the above is from the life it hardly seems possible that gulls could get their nests done at all if they worked no better than this. When I first got to that island "de cuyo nombre no quiero acordarme," but few eggs had yet been laid and many of the nests were only half finished, or not even so far advanced as that. Most, however, were completed, or nearly so, and it is probable that what I saw represented merely the finishing touches, which will also apply to the great skuas.

What I saw was, indeed, very little, and it is only a surmise that the female gull builds the nest without being aided by the male. I think so, however, because usually, when both the male and female assist in the building, they work together, and whilst collecting the materials keep more or less in each other's company, arriving with them either at the same time or shortly after each other. This, at least, has been the case with those birds which I have watched. I have, indeed, seen two gulls pulling up the moss or heather within a yard or so of each other, and these I at first put down as a married couple. This, however, was not