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What features does the Peregrine Falcon have that makes it the fastest bird known?
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The peregrine falcon has many features that set it apart from other birds, making it one of the deadliest predators out there. These features are its keel, pointed wings, stiff feathers, and incredibly efficient respiratory and circulatory systems. 
- A bird’s keel is a bone specialized for flight, a modified breastbone. A birds muscles for flapping are attached to its keel. The peregrine falcon has a very large keel, allowing more muscle to be attached to it and in turn more flapping power to be generated.
- The peregrine falcon’s pointed wings also help the bird reach its mind-boggling speeds. The wings are swept back and contributed to the bird’s streamlined figure. The curved wings create an air foil effect in multiple dimensions, maximizing maneuverability, lift, and speed. 
- The feathers of the peregrine falcon also contribute to its high speeds. The feathers are slim and stiff, reducing the drag that can be caused by loose limp feathers. 
- The peregrine falcon appears extremely aerodynamic, but if it were not for its incredibly efficient respiratory and circulatory systems, it would not be able to reach the speeds it does. The peregrine falcon can breathe effortlessly at speeds of over 200 mph while other birds can’t even breathe when flying at speeds half as fast.

Source: https://blogs.bu.edu/biolocomotion/2011/12/12/why-can-the-peregrine-falcon-fly-so-fast/