Nine days of Banksy, but what do the works mean?

World-famous graffiti artist Banksy has concluded his animal trail, after nine days of pop-up artworks dotted around the capital ended with a piece on the shutters of London Zoo.

Although all the surprise pieces have now been unveiled, speculation over the inspiration behind them persists. What do they mean, and how have they been received by the art and graffiti worlds?

Banksy's final piece, outside London Zoo in Camden, north London, shows a gorilla lifting the shutter to release a sea lion and birds, while other animals appear to look on from the inside.