https://en.wikipedia.org/wiki/North_American_XB-70_Valkyrie The North American Aviation XB-70 Valkyrie was the prototype version of the planned B-70 nuclear-armed, deep-penetration strategic bomber for the United States Air Force Strategic Air Command. Designed in the late 1950s by North American...

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more at https://www.sciencenews.org/article/new-robot-pigeon-can-bend-wings-like-real-bird Pigeons may be considered rats of the sky, but some scientists have found greater value in these urban birds: the blueprint for a new generation of flying machines. Birds can modify the shape of their wings...

more at https://www.sciencenews.org/article/new-robot-pigeon-can-bend-wings-like-real-bird Pigeons may be considered rats of the sky, but some scientists have found greater value in these urban birds: the blueprint for a new generation of flying machines. Birds can modify the shape of their wings...