大象传媒

Tweet of the Day is a series of fascinating stories about our British birds inspired by their calls and songs. Chris Packham presents the Mute Swan. Mute Swans are deeply embedded in our culture. They are unique among British birds because the Crown retains the rights of ownership of all unmarked mute swans in open water. Since the 15th century, an annual census of mute swans has been held annually on the River Thames.