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

Bill Oddie presents the treecreeper. Treecreepers are common woodland birds but because their high-pitched almost whispering song, is often drowned out by the dawn chorus, they're often overlooked. The first glimpse may be a silhouette, its belly close to the bark, braced by stiff tail feathers. It has a curved, tweezer-like bill with with which it delicately probes for hidden insects and spiders deep in the crevices of the bark.