Have you seen this blue seagull at our beach?

Several readers have mentioned they've spotted an unusual coloured seagull recently at Geraldton's beaches. We can't say we've ever seen one this colour.  

Any theories? 

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Thanks Leonie for sending in these pics.  

Thanks Leonie for sending in these pics.  

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Thanks Emily for sending these pics in.  

Thanks Emily for sending these pics in.