Fun with Google

Let the battle begin! ...

• Number of hits for "invasive species": 12,600,000 (a 400% increase since October 2005!)
• Number of hits for "exotic species": 2,930,000
• Number of hits for "alien species": 2,090,000
• Number of hits for "introduced species": 1,370,000
• Number of hits for "non-native species": 1,070,000
• Number of hits for "non-indigenous species": 409,000
• Number of hits for "nuisance species": 376,000

Winner by a landslide massive erosion: "invasive species"!