The BBC Nature page has a feature this week called "Space Invaders". It talks about how certain bird species, including the collared dove and the Mediterranean gull, have expanded their range and are now quite common in the U.K. Whether this constitutes an "invasion" could be debated, but the appearance of these birds has certainly had ecological consequences. Doing a Google search for 'Mediterranean gull' will bring up lots of "first sightings" in the U.K. and Scandinavia.
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