sentences:  Of these species, 185 are rare or accidental and six have been introduced by humans.This list's taxonomic treatment (designation and sequence of orders, families and species) and nomenclature (English and scientific names) are those of "The Clements Checklist of Birds of the World", 2019 edition.The following tags are used by the Danish Ornithologcial Society (Dansk Onitologisk Forening, DOF) to highlight some categories of occurrence.