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Discovered decades ago and formally described in 1980, Argentavis magnificens is the largest bird known. It lived six million years ago during the Miocene period throughout Argentina. It is nearly the size of a Cessna 152 light aircraft, with a 23-foot (7-meter) wing span and weighing approximately 150-pounds (70-kilograms). However, even though this bird's muscles were well-developed, they still were not sufficient to generate enough lift for the giant bird to leave the ground. So how did this, the largest of all birds, fly?