05:58Tweet of the DayYellow WagtailBBC Radio 4 Duration: 2 minutes Fri 16th Aug 2013, 05:58 on BBC Radio 4 LWAvailable for over a yearListen nowMichaela Strachan presents the story and sound of the yellow wagtail. Show more GenresFactualScience & NatureBrandTweet of the Day Source: BBC Online