Species with a status of BBRC (British Birds Rarities Committee) are nationally rare and require full descriptions.
The three figures after BBRC or ESIP follow the rules defined by Wood(1996):
The first figure denotes the total number of records in Essex up to and including those detailed in the Guide (Cox 1984) plus any historic records that have since been accepted by BBRC/BOURC/EBSIP e.g. 1826 American Bittern, 1868 White-tailed Eagle
The second figure denotes the total number of records from the period 1981/82 to present.
The third figure denotes the total number of Essex records.
