World's Biggest Beaver Dam Visible From Space

Canadian beavers built the world's longest dam -- so big it can be seen from space.  At 2,790 feet, it is more than a half mile long.

It is twice the size of what was the world's largest, the Hoover dam, which borders Arizona and Nevada in the U.S. and spans 1,244 feet. The furry critters use trees, mud and stone to make a type of moat where they can use their swimming skills to evade any predators.

The dam, located on the southern edge of Wood Buffalo National Park in Northern Alberta, central Canada, was spotted by experts monitoring the size and spread of beaver dams in North America.

It is thought that several beaver families joined forces to create the massive dam, containing thousands of trees, and took many months to complete it.

Original article here.