. Bulletin of the British Ornithologists' Club. Birds. Colin J. Bibby & Adrian J. del Nevo 184 111(4). Figure 1. Pterodroma caught on the Azores, 28 June 1990. Drawn by M. Langman from a photograph. Observations In conjunction with the Universidade dos Azores and as part of a long- term involvement in the study and conservation of Azorean seabirds, we made a number of visits to off-shore stacks and islets, to investigate the status of breeding seabirds. Where possible an overnight stay was made and mist nets were used to catch, ring and record biometrics of nocturnal seabird
. Bulletin of the British Ornithologists' Club. Birds. Colin J. Bibby & Adrian J. del Nevo 184 111(4). Figure 1. Pterodroma caught on the Azores, 28 June 1990. Drawn by M. Langman from a photograph. Observations In conjunction with the Universidade dos Azores and as part of a long- term involvement in the study and conservation of Azorean seabirds, we made a number of visits to off-shore stacks and islets, to investigate the status of breeding seabirds. Where possible an overnight stay was made and mist nets were used to catch, ring and record biometrics of nocturnal seabirds. Trapping and recapture took place on several nights in an attempt to establish initial population estimates. During one of these sessions, we caught a gadfly petrel shortly after midnight on 28 June 1990. The bird was broadly white below and grey-brown above with a much paler dove-grey tail. The dark grey to black surrounding the eye, the steep white forehead, mottled with grey, and the large heavy bill were promi- nent features (Fig. 1). The flanks were white, lightly mottled with grey. A collar of slightly darker grey than the mantle extended some 5-10 mm onto the foreneck/upper breast. The axilliaries were pure white with some grey flecking at the tips of the feathers. The lesser underwing coverts were pale brown and contrasted with the darker edges of the rest of the underwing. The underwing pattern was probably not sufficiently clear as to show markedly in the field. The Madeira and Bugio birds are not yet known to differ in any plumage features although the latter appears to be rather more mottled on the flanks. Our bird matched descriptions and photographs of these two species without obvious exception. It had no suggestion of the white rump of either the Bermuda Petrel or Black-capped Petrel P. hasitata nor of such bold underwing pattern as illustrated by Harrison (1983). It lacked the dark breast band of the typical form of Soft-plumaged Petrel P. m. mollis. Critica
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1893
