http://www.nytimes.com/2011/05/14/science/earth/14parakeet.html?hp
England seems to have developed a sudden spike in the number of Parakeets flying around and bothering people – they are not a native species to England. They are native to subsaharan Africa and Asia.
What could possibly be the source? *shrug*
I doubt it has anything to do with the Channel Tunnel, though.