Hooky, Have there been any changes in the environment near you? Perhaps the Blackies have been frightened off. Perhaps a neighbour of yours has begun putting out bird food and is enticing your regulars away. Or perhaps your Blackbirds are undergoing a late moult. The possible explanations are many. Our Blackbirds have not been spending much time in the garden but perhaps they are finding enough food elsewhere and will probably be back when the weather deteriorates.
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Have seen them in surrounding trees Hooky but none in garden yet although many berries await them, weather is exceptionally mild down here in EKent!