THERE IS A MOMENT when a peregrine falcon, hundreds of feet in the sky, identifies a target below. The raptor stalls for a moment in the thermal current, draws in its wings, and gracefully does a 180-degree rotation to its back. Now bullet-shaped and sleekly aerodynamic, the peregrine falls through the sky, gaining more and more velocity until its speed reaches more than two hundred miles an hour. It is the fastest creature on earth, and as it shrieks through layers of changing crosscurrents and atmosphere, it subtly keeps a perfect bead on its prey by slightly shifting a wing or moving its
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