This list's taxonomic treatment (designation and sequence of orders, families and species) and nomenclature (common and scientific names) follow the conventions of "The Clements Checklist of Birds of the World", 6th edition with a few changes to match the list of the Gibraltar Ornithological & Natural History Society. The family accounts at the beginning of each heading reflect the Clements' taxonomy, as do the species counts found in each family account. Introduced and accidental species are included in the total counts for Gibraltar.