The peregrine falcon is the fastest animal on earth - it can reach speeds of over 200mph. But what does it take to be a high-speed record breaker? To find out, we follow a young family of falcons as they grow up in downtown Chicago.

We join renowned bird handler Lloyd Buck, who, with the help of state-of-the-art technology and leading avian scientists, puts his peregrines to the test. And finally, we see if Lloyd can train one young peregrine for the ultimate challenge of speed and agility - against an Olympic skier in the Swiss Alps. Through such groundbreaking experiments and intimate views of these special birds in the wild, the secrets behind these super-fast falcons can finally be revealed.