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Tweet of the Day is a series of fascinating stories about our British birds inspired by their calls and songs.

Chris Packham presents the story of the Mandarin Duck. A drake mandarin has orange whiskers, red bill, a broad creamy eye-stripe and an iridescent purple chest, set off by a pair of extraordinary curved orange wing feathers which stand up like a boat's sails. Today there are seven thousand birds living in the wild and the numbers are increasing.