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I think it is only two.
In Liverpool, apparently!:-) Years ago (in the 70's, I think?) there was an extremely popular TV series entitled 'The Liver Birds' ... a sit-com about the trials and tribulations in life of two 'Liver Birds). I'm not aware, however, that this term is in common usage (as in Scousers from Liverpool, Brummies from Birmingham, etc) There is a building in the centre of Liverpool in England with statues of Liver birds on top.
There are only two Liver Birds in existence. Both birds are fastened securely to the top of the Liver Building, Pier Head, Liverpool, with thick cables so that they could never escape. If they did manage to escape, Liverpool (or so the fable goes) would cease to exist.
The Liver Birds
The Liver Birds - 1969 Three's a Crowd 2-6 is rated/received certificates of: UK:PG (video rating) (2002)
Liverpool mascot is called liver bird
The duration of The Liver Birds is 1800.0 seconds.
The Liver Building.
The Liver Birds was created on 1969-04-14.
The Liver Birds ended on 1978-12-29.
The logo of Liverpool football club is the liver bird.
The "Liver Bird" is often used as the logo for Liverpool. It has represented the city since medieval times and takes the form of a cormorant-like bird with a frond in it's beak. The most prominent example of the Liver Bird is on top of the Royal Liver Building. Liverpool Football Club is also represented by the Liver Bird and the Club now hold the copyright to the symbol.