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Blackbird populations are dropping, especially in London where the total fell 50 per cent in 2020, said the British Trust for Ornithology (BTO), because of the spread of Usutu virus.

South africaCity ofUnited kingdomGreater londonUnited kingdom generalHugh hanmerBritish trust for ornithologyBritish trust for ornithology populationsBlackbirds in gardensBritish trustGardens surveyArran folly