This 31 August camera trap video, made by Harrie Bosma near Woudsend village in Friesland province in the Netherlands, shows that a beaver has started to build a dam there.
This is the first time for this species since about 350 years.
In 2008, beavers had been introduced to Groningen and Drenthe provinces, bordering on Friesland. But this is the first proof they have crossed the Friesland border.
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