Talk about busy as a beaver. These ones have been busy for over 40 years!
The massive 850-metre long (2,800 feet) dam was first spotted on satellite photos in 2007 - in Wood Buffalo National Park, about 190 kilometres (118 miles) northeast of Fort McMurray.
Most dams are reported to be anywhere from 30 to 300 feet at their longest, but this dam, almost 3000 feet, sprawls out in a birdlike kind of shape.
Thie says construction probably started around the mid-1970s, but that it clearly continues today.
Source(s): shared
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