Manx Shearwater d i g g i n g by daylight.--At about 2.30 p.m. on 15th May 1961, I was walking in bright sunlight on a sloping cliff on Skokholm, Pembrokeshire, when I heard a Manx Shearwater (Procellaria puffinus) calling from its burrow. Kneeling down with my face close to the entrance, I could hear much heaving and panting, and many gentle grunts and squeaks unlike the usual calls. The bird was...

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