Tweet of the Day is a series of fascinating stories about our British birds inspired by their calls and songs.
Chris Packham presents the fieldfare. Fieldfares are thrushes, and very handsome ones. They have slate-grey heads, dark chestnut backs and black tails and their under parts are patterned with arrows. Although birds will stick around if there's plenty of food available, fieldfares are great wanderers and are quick to move out in freezing conditions.