Species that have not yet occurred in the British Isles or are exceedingly rare, or are otherwise highly desirable.
Species currently considered for acceptance by the British Birds Rarities Committee (or forms of equivalent rarity).
Broadly speaking, species that are covered in British Birds' annual review of scarce species (and forms of similar rarity).
Generally fairly regular or common species that a 'county lister' or a birding beginner might be interested in going to see.
Common species, including species that are certain or probable escapees from captivity when occurring in the British Isles.
Species that are unlikely to appear as wild birds in Britain or Ireland
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