Why peregrines are so fast

They 'pop up' their feathers.  http://www.dailymail.co.uk/sciencetech/article-2572799/The-physics-FALCONS-Scientists-unravel-exactly-peregrine-fastest-moving-creature-planet.html

Peregrines, once nearly extinct, now thrive in cities.

Thanks again to FALCONERS.  Peregrines thrive.  http://www.nytimes.com/2000/02/15/science/once-near-death-a-comeback-bird-thrives-in-cities.html?smid=fb-share