Interesting list. It's clearly not trying to sensationalize, or the Brown Tree Snake would have been higher. The explanation of the methodology at the top is

Interesting list. It's clearly not trying to sensationalize, or the Brown Tree Snake would have been higher. The explanation of the methodology at the top is good. A little more detail for each of the entries would have been nice. I've not heard of the #1 entry before and don't quite see how it meets the criteria to the degree of being the most harmful invasive in the world.