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A falcon (/ˈfɔːlkən, ˈfæl-/) is any one of 37 species of raptors in the genus Falco, widely distributed on all continents of the world except Antarctica.

Adult falcons have thin, tapered wings, which enable them to fly at high speed and to change direction rapidly. Fledgling falcons, in their first year of flying, have longer flight feathers, which make their configuration more like that of a general-purpose bird such as a broadwing. This makes it easier to fly while learning the exceptional skills required to be effective hunters as adults.

The falcons are the largest genus in the Falconinae subfamily of Falconidae, which itself also includes another subfamily comprising caracaras and a few other species. All these birds kill with their beaks, using a "tooth" on the side of their beaks — unlike the hawks, eagles, and other birds of prey in Accipitridae, which use their feet.

The largest falcon is the gyrfalcon at up to 65cm in length. The smallest falcons are the kestrels, of which the Seychelles kestrel measures just 25cm. As with hawks and owls, falcons exhibit reverse sexual dimorphism, with the females typically larger than the males, thus allowing a wider range of prey species.[1]

Some small falcons with long, narrow wings are called "hobbies", and some which hover while hunting are called "kestrels".

As is the case with many birds of prey, falcons have exceptional powers of vision; the visual acuity of one species has been measured at 2.6 times that of a normal human.[2] Peregrine falcons have been recorded diving at speeds of 200 miles per hour (320 km/h), making them the fastest-moving creatures on Earth.[3]