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For many years Scottish Crossbill has been claimed to be the only endemic species from probably the most intensively birded/studied nation in the world. Despite much study, and observation by hundreds (thousands?) of birders each year in a bird tourism hotspot, it is quite astonishing that it is still one of only 60-70 species globally classified by IUCN / BirdlLife International as 'Data Deficient', i.e. in the same category as Vaurie's Nightjar, Sillem's Mountain Finch etc.!
Given the complex and yet to be understood worldwide variation in crossbills, it's hard not to conclude that otherwise conservative views on taxonomy were slightly stretched to allow the perhaps premature recognition of a national endemic (and possibly to provide additional justification for the conservation of Caledonian pine forest?).
[And then there's the prevalence of Parrot Crossbill in Scotland in some years, despite continuing classification as a BBRC rarity.]