The British Birds Rarities Committee (BBRC), established in 1959, is the national bird rarities committee for Britain. It assesses claimed sightings of bird species that are rarely seen in Britain, based on descriptions, photographs and video recordings submitted by observers. Its findings are published in an annual report in the journal British Birds.
The BBRC covers around 280 species whose annually recorded sightings in Britain fall below a threshold deemed to signify rarity. Since the establishment of the Committee, some previously included species have become more common—or at least better recorded; this has resulted in their removal from the Committee's list and their reclassification as "scarce migrants".
The Committee has a chairman, a secretary, and ten voting members, and is supported by others who serve in an advisory capacity. Since its inception, a total of 69 people have served on the committee as assessors. In addition to assessing annual records of rare birds, the committee conducts regular reviews of batches of previously accepted records on a species-by-species basis, to ensure that only those consistent with advances in knowledge of bird identification are retained, and to determine the subspecies of accepted records. Several species have been problematic for assessment, and extreme examples have taken more than 20 years from initial observation to acceptance. The Committee has been criticised for its approach to assessing records where only one observer was present, for not publishing reasons for rejecting the validity of records, and for placing undue weight on descriptive detail when assessing record submissions. Seabird identification has proved particularly difficult, leading some observers to suggest that the Committee sets too high a standard.
Read more about British Birds Rarities Committee: Role and Status, Species Covered, Structure and Personnel, Annual Report and Other Publications, Record Reviews
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