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An ecologist claims he spotted the super-size rodent den while using satellite technology through the internet site Google Earth. "I couldn't believe it when I saw it - it's a vast, vast area," Jean Thie said. "There may be longer dams out there, but this, by far, is the largest I have seen so far." The dam spans 2,788 feet (850 metres) and has been seen by Nasa from space. "It might be hard to believe, but there are a few things that are visible from space, and beaver dams are among the few animal-made structures that are," the ecologist said. "It would not have been possible to view it without something like Google Earth." satellite image made available by Google Maps shows a beaver dam, more than eight football fields long, situated in northern Alberta's Wood Buffalo National Park Google Map showing the dam that is more than eight football fields long The dam sits in a corner of a park "the size of Switzerland" in an area surrounded by heavily forested marshland, Wood Buffalo National Park spokesman Mike Keizer said. Using past Nasa images and park aerial photography, Thie worked out that the beavers began their work four decades ago - meaning the monster construction must have been worked on by several generations. North American beavers build dams to create deep, still pools of water to protect against predators and to float food and building materials. A 652 metre structure in Three Forks in the US state of Montana previously held the record for world's largest beaver dam