Click on the links below to see this 3-part series of BBC videos on YouTube.
Beaver facts - BBC Animals
Sir David Attenborough narrates this interesting animal video following a beaver gang as it builds a dam.
How Beavers Build a Lodge in just 20 days - BBC Animals
Beavers in the Snow - BBC Animals
Don't forget to subscribe to the BBC Worldwide YouTube channel.
Image source: A European Beaver, Wikipedia, GNU Free Documentation License.