He's not in a cage btw the picture is through the bars at a playground.
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Regards, Hazel
As Hazel has said a Buzzard's plumage colouring can vary widely. I think this is what they call a pale morph. I found this article which has a photo showing three examples from a dark variant though an intermediate form to the very pale form which you saw.
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Tony
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Pete
Birding is for everyone no matter how good or bad we are at it,enjoy it while you can