Frost, B, Woolsey, A. K, Evans, P. R, Soper, E. A, Crosby, M. D, Ruttledge, R. F & Harrison, C. J. O / September 1961 – vol. 54, issue 9–367 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... This article is only available to registered users.To read more, please log in or purchase a subscription.