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A comment on Pioneering study finds more than 200,000 rats in Barcelona’s sewers. Parent comment

Re:Pioneering study finds more than 200,000 rats in Barcelon... by pc86 on Tuesday September 25, 2018 @09:40AM (#18066204)
Why do we need to remove them if they're not useful to humans? Ecologically I think it's hard to estimate the impact of removing an entire species from a given area.
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Re:Pioneering study finds more than 200,000 rats in Barcelon... by lostlogin on Tuesday September 25, 2018 @10:45AM (#18066705)
Yes. When they are not native they can be very harmful - for example they badly damage bird life in New Zealand.
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