I think that one of the prettiest birds of prey, and they are impressive fliers. Here is what 'All About Birds' https://www.allaboutbirds.org/guide/Peregrine_Falcon/id) has to say about them:

"Powerful and fast-flying, the Peregrine Falcon hunts medium-sized birds, dropping down on them from high above in a spectacular stoop. They were virtually eradicated from eastern North America by pesticide poisoning in the middle 20th century. After significant recovery efforts, Peregrine Falcons have made an incredible rebound and are now regularly seen in many large cities and coastal areas."

Cool Fact about the Peregrine Falcon from 'All About Birds' -

"The Peregrine Falcon is a very fast flier, averaging 40-55 km/h (25-34 mph) in traveling flight, and reaching speeds up to 112 km/h (69 mph) in direct pursuit of prey. During its spectacular hunting stoop from heights of over 1 km (0.62 mi), the peregrine may reach speeds of 320 km/h (200 mph) as it drops toward its prey."

It is always a privilege to see such a bird.