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A falcon is any species of raptor in the genus Falco. The genus contains 37 species, widely distributed throughout Europe, Asia, Africa, Australasia and North America. 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 makes 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.Peregrine Falcons have been recorded diving at speeds of 200 miles per hour (320 km/h), making them the fastest-moving creatures on Earth.
Other falcons include the Gyrfalcon, Lanner Falcon, and the Merlin. Some small falcons with long narrow wings are called hobbies, and some which hover while hunting are called kestrels. The falcons are part of the family Falconidae, which also includes the caracaras, Laughing Falcon, forest falcons, and falconets.

The traditional term for a male falcon is tercel (British spelling) or tiercel (American spelling), from Latin tertius = third because of the belief that only one in three eggs hatched a male bird. Some sources give the etymology as deriving from the fact that a male falcon is approximately one third smaller than the female[2][3][4] (Old French tiercelet). A falcon chick, especially one reared for falconry, that is still in its downy stage is known as an eyas (sometimes spelt eyass). The word arose by mistaken division of Old French un niais, from Latin presumed nidiscus ("nestling", from nidus = nest). The technique of hunting with trained captive birds of prey is known as falconry.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. source: Wikipedia

Peregrine Falcon in-flight

Close view at an adult female Peregrine Falcon flying by over the Hudson River in the Palisades, Bergen County, NJ bird and wildlife photography - Canon 1Dx 600mm f/4 IS II

Peregrine Falcon

Juvenile Peregrine Falcon perched on the edge of the cliff at the Palisades, NJ wildlife photography Canon EOS 1Dx 600mm f/4 IS II

Peregrine Falcon

Perched adult female peregrine falcon looking straight up into the camera, Northern New Jersey bird photography - Canon 1Dx 600mm IS mark II

Juvenile male Peregrine Falcon

Juvenile male Peregrine Falcon head-on flight - New York bird photography Canon 1Dx 600mm f/4 IS mark II

Peregrine Falcon

New Jersey Bird Photography - Peregrine Falcon on a green background perched Falco peregrinus Palisades Interstate Park, Alpine

Peregrine Falcon

Peregrine Falcon in-flight Falco peregrinus Palisades Interstate Park, Alpine, New Jersey flying

Perched adult male Peregrine Falcon

Adula male Peregrine Falcon perched between the branches looking straight into the camera - New Jersey bird photography Canon EOS 1Dx 600mm f/4 IS II

Peregrine Falcon

Peregrine Falcon

American Kestrel with a mouse

Female American Kestrel holding a field mouse in its beak - DeKorte Park, Meadowlands, New Jersey bird photography - Canon 1Dx 600mm f/4 IS 1.4x extender

Juvenile Peregrine Falcon

Excited juvenile Peregrine Falcon rising its foot and wings - New Jersey bird photography - Canon 1Dx 600mm IS f/4 II 1.4x extender