Tweet of the Day is a series of fascinating stories about our British birds inspired by their calls and songs.
Bill Oddie presents the goldeneye. Although they're a common winter visitor, you'll need to travel to Speyside in the Scottish Highlands to see goldeneyes in their breeding season where, since 1970, a small population has bred there. Unlike dabbling ducks, such as mallard and teal, they don't need muddy shorelines and lots of vegetation. Goldeneyes are diving ducks that feed mainly on shellfish and crustaceans.