Read on, ( near end of the article)
"
Chinese mitten crab are also said to be causing a problem as they breed in the Dee estuary and migrate along its tributaries where they are known to burrow into banks which can also present a flood risk."
http://www.bbc.co.uk/news/uk-wales-23094466
More info
http://en.wikipedia.org/wiki/Chinese_mitten_crab
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