Tweet of the Day is a series of fascinating stories about our British birds inspired by their calls and songs.
John Aitchison presents the black-throated diver. Black-throated divers are strong contenders for our most beautiful bird. Their breeding plumage with a neck barcoded in white, an ebony bib and a plush grey head, is dramatic. The black dagger-like bill and broad lobed feet are perfect for catching and pursuing fish which the divers bring to their chicks in nests on the shoreline of the Scottish Lochs on which they breed.