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Immigrants that arrived by canal 
PETER FROST takes a stroll by the towpath
All kinds of surprising species can be found by the canal

BRITAIN has over 3,000 miles of inland waterways, and towpaths walks are a wonderful way to get to get out and enjoy the natural environment.

Not all the plants and animals you will see on your walks are welcome here. 

Invasive species can do much damage to our native plants and animals and, amazingly, some can actually damage the very structure of the canals and rivers we enjoy.
  
Some arrived by ship, often stowing away or attached to the hull. They dropped off in our British ports and from there migrated along the canals.
  
Others were deliberately brought here because of their beauty or interest.

A red-eared terrapin
Himalayan balsam is hard to keep at bay
Mink should not be confused with otters
The signal crayfish (Pic: Astacoides/Creative Commons)
The edible dormouse (Pic: Azay/Creative Commons
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