This is a close up of the world’ s fastest bird, a Peregrine Falcon. It can dive at an unbelievable speed of 389 km/hr.
Peregrine Falcon - the fastest flying bird

This a great example of how nature and animals evolve – it is a constant re-engineering for making a better model.
Now give a closer look at its nostril – you would notice a ‘Flap” located little inside. These flaps close the airways to the lungs when it dives at such high speed. This prevents the lungs from bursting with extreme wind pressure.
Gajoldoba wetland, Nikon gears. Jan 2019