High Quality Content by WIKIPEDIA articles! The Peregrine Falcon (Falco peregrinus), also known as the Peregrine, and historically as the Duck Hawk in North America, is a widespread bird of prey in the family Falconidae. A large, crow-sized falcon, it has a blue-gray back, barred white underparts, and a black head and "moustache". Typical of bird-eating raptors, Peregrine Falcons are sexually dimorphic, with females being considerably larger than males. The Peregrine is renowned for its speed, reaching over 325 km/h (202 mph) during its characteristic hunting stoop, making it the fastest member of the animal kingdom.