Tweet of the Day is a series of fascinating stories about our British birds inspired by their calls and songs.
Chris Packham presents the teal. Teal are our smallest duck and the drakes are striking birds, heads burnished with chestnut surrounding a green mask fringed with yellow. They whistle softly in a piping chorus which sounds, from a distance, like the chime of tiny bells. That sound of the male's call is probably the origin of the bird's name, teal.