Posted AT 8:33 AM EST on 08/08/08
Invasion of the New Zealand mud snails
They are only a few millimetres long, hard-shelled and humble. But the New Zealand mud snails have laid siege to four of the five Great Lakes and are threatening to invade rivers and streams, too.
A Penn State research team says these foreign-intruder species that have long been a problem in the western United States could have the ability to change ecosystems in the East.
"Invasive species in general often have substantial negative effects. ...
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