BBRC has had particular problems with a number of rare seabirds. The ""Chalice" petrel", a dark-rumped storm petrel seen and photographed in the Southwest Approaches in 1988, and believed by its observers to be a Matsudaira's storm petrel, was eventually rejected as other similar species could not be ruled out. Martin Garner and Killian Mullarney subsequently wrote a critical review of this decision, arguing that the evidence points to the bird having been a Swinhoe's storm petrel, the only dark-rumped storm petrel species otherwise recorded in the North Atlantic. They argued that the Seabirds Advisory Panel's assessment of the record was at fault, and a critical reappraisal of the evidence should have been prompted by the (then relatively recent) discovery in the North Atlantic of Swinhoe's storm petrel, and that the committee was instead too heavily swayed by the views of a single expert.