Rock doves are the ancestors of the city pigeon and most so-called 'rock doves' are hybridised with these but there are said to be some flocks in northern Scotland and the western and northern isles which are genetically pretty close to the original. The only way for an amateur to judge is that true rock dove flocks don't have much variation in colour from grey with the two-barred black wing marking - and the Dunrobin flock fits that bill.
So our population of what look like 'pigeons' might be something a little special.
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