According to this article from the BBC brown rats are 'among the most invasive mammals in Europe". This is the result of research coming from Switzerland. It goes on to mention other species such as Muskrat and Sika Deer. In order to produce the study the researchers developed a scoring system - a " general system of impact categories was needed, which allowed scoring and comparison of all potentially relevant types of environmental and economic impacts".
I'm left puzzling why the mammal with the most significant impact is not mentioned. Or are farmers, landscape managers road builders etc. in a different category?
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