Petrels (Oceanodroma leucorrhoa) have been known to breed on the Flannan Isles, some 20 miles west of Lewis in the Outer Hebrides, since 1904 ( W . Eagle Clarke, Annals Scot. Nat. Hist., 1905, pp. 8-19 and 80-86). However, apart from the discovery of colonies on Eilean Tighe in 1955 (R. Atkinson and B. Roberts, Scot. Nat., vol. 67, pp. 109-110), the only proved nesting has been on Eilean M6r (R. A...

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