It’s an interesting way to get yourself clean but I’m sure you’ve all seen birds sunning themselves like this Blackbird, head up and beak open as if panting with the heat, body close to the ground with wings outspread. The BTO website gives two reasons for this behaviour:

It helps oil from the ‘preen gland’ to spread across the feathers, keeping them healthy and in good condition. It also drives parasites out from within the plumage. Some of these parasites feed on the feathers themselves, degrading their quality and function, and all are highly specialised, with many only found on a single species of bird.

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