Flying On Gigantic Wings

For a few thousand years the biggest things in the skies were only in our imaginations, flying figments of myth and fable: the Roc from Sinbad’s tales, the Garuda bird from the Mahabharata, the Thunderbird from North America, the Brazilian Blue Crow, and other high-flying nightmares or soaring benevolent gods and spirits.

http://www.darkroastedblend.com/2008/09/monstrous-aviation-worlds-biggest.html