This woodland construction is actually the world's biggest beaver dam. It is so big that it spans twice the width of the Hoover dam and can even be seen from space.

The enormous edifice measures 2,790ft (850metres) in length and shows the skill of the big-toothed furry animals.

The mammals use trees, mud and stone to make a type of moat where they can use their swimming skills to evade any predators

http://www.dailymail.co.uk/sciencetech/article-1272045/Eager-beavers-build-giant-dam-Hoover-proud.html