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Tweet of the Day is the voice of birds and our relationship with them, from around the world.

Sir David Attenborough presents the globally widespread but secretive black stork. High up in a forest canopy, the black stork is a large but fairly secretive and mostly silent bird. They are also strong migrants capable of sustained flight, flying up to 7,000 kilometres or more, often over open seas. Black storks are summer visitors to eastern Europe and breed from Germany across Russia to Japan. A small population is resident in Spain, but most birds migrate south in winter to Africa, India or China. Unlike their relative the more flamboyant and colonial nesting white stork, black storks are a solitary nester. It is at this time of the year adults can produce a few grunts or bill clapping sounds during courtship, the young however are far more vocal at the nest.