T H E FIRST WRITER to mention the existence of a W r e n (Troglodytes troglodytes) on St. Kilda, over a hundred miles west of the Scottish mainland and half that distance from the Outer Hebrides, was Martin (1698); but it was left to Macaulay (1764) to pose the first of innumerable questions which have sprung from the wonderment of naturalists that such a bird should be there at all: " H o w these ...

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