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The largest so-far known flying animal on this here earth was the quetzalcoatlus. At 10 meters, its wingspan falls far short of 1000 feet you mention. (image from wikimedia) However, the mecha...
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The largest so-far known flying animal on this here earth was the quetzalcoatlus. At 10 meters, its wingspan falls far short of 1000 feet you mention. (image from wikimedia) However, the mecha...