05:58Tweet of the DayBlue Rock ThrushBBC Radio 4 Duration: 1 minute Wed 7th Jan 2015, 05:58 on BBC Radio 4 FMAvailable for over a yearListen nowLiz Bonnin presents the blue rock thrush, perched high on a Spanish castle. Show more GenresFactualScience & NatureBrandTweet of the Day Source: BBC Online