Supplemental List

The Supplemental List, a subset of the California Bird List, includes those species recorded in the state for which the CBRC has determined that all records of birds of established identity are of uncertain natural occurrence. Species judged by the CBRC to be probable escapees are not admitted to the Supplemental List. A species of uncertain natural occurrence in California is admitted to the Supplemental List if a record of the species receives a majority vote to accept, or if a majority of members at a meeting votes in favor of placing the species on the Supplemental List. Bylaw VI. I (6) explains the formal processes by which species are admitted to and removed from the Supplemental List (see Appendix A).

The Committee has evaluated records of many more species of questionable natural origin. Please refer to the “Accounts of Species of Hypothetical Occurrence or Origin.”