<p><b>Examples of Alien Species in Europe and the Mediterranean Basin.</b>
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The zebra mussel (<i>Dreissena polymorpha</i>), introduced from Russia via shipping canals to non-native areas in Europe in the 18th and 19th centuries and later to North America, where it has large negative impacts
Dan Minchin
CC BY 2.5
<i>Amassing Efforts against Alien Invasive Species in Europe.</i>  Shirley SM, Kark S, PLoS Biology Vol. 4/8/2006, e279. <a rel="nofollow" class="external free" href="https://dx.doi.org/10.1371/journal.pbio.0040279">https://dx.doi.org/10.1371/journal.pbio.0040279</a>