David, I didn't know they came from Spain but I wonder what native species they have replaced. Kestrels? Plenty of those. There are now kites, I am told, in central London. In fact ALL birds of prey have increased lately, perhaps due to less poisons in the farmer's armoury.I saw a pair of Marsh harriers round here (over a marsh natch) and buzzards are around too. And wasn't there a peregrine falcon in Trafalgar Square after Ken Livingstone's pigeons. Go, go Peregrine.
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