One of the best known facts about Liverpool (aside from football and musical associations) the presence of the two "Liver Birds" on top of the Royal Liver Building on the waterfront. According to legend, if the Liver Birds were to fly away, the Mersey would burst its banks and flood the city.
The Liver Birds were derived originally from a mediaeval seal of the city which depicted a rather badly drawn bird. Opinions on what this was intended to be differ, some suggesting a dove and some an eagle. One way or another, the origins were forgotten and the city settled on a cormorant as the symbol to be included in its coat of arms. There is also a vague cross-reference to William Warburton, author and Bishop of Gloucester in the 18th Century, who had three cormorants on his coat of arms.