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RE: Biodiversity - why we can not allow it's loss
Yes, exactly. That's the problem of introduced species that become invasive! Same happens with some introduced plants and other organisms!
Fortunately, in Portugal, we only have the red squirrel, and they're some results showing the populations are increasing.
Glad the reds are doing well where you are! Fish in our rivers too! CRAZY!!
I'm so glad that you are aware of this problem! When people understand the negative implications of introducing species elsewhere, they start behaving and taking only pictures, instead of plants/animals! :))