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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

Juvenile Peregrine Falcon

Juvenile Peregrine Falcon spreading its wings showing down feathers - New Jersey endangered bird of prey photography

Peregrine Falcon

Adult Peregrine Falcon (Falco peregrinus) perched on a dead tree hanging off the cliff in Palisades Interstate Park, State Line Lookout, New Jersey Canon 1Dx + 600mm + 1.4x extender

Peregrine Falcon

Adult Peregrine Falcon looking up and sticking out its tongue - NJ bird of prey photography Canon 1Dx 600mm f/4 IS II

Fledgling Peregrine Falcon flapping its wings

Young Peregrine Falcon (Falco peregrinus) stretching its wings while standing on the edge of a cliff in Bergen County, NJ bird of prey photography Canon 1Dx 600mm f/4 IS II

Juvenile female Peregrine Falcon

Banded juvenile female Peregrine Falcon perched on a cliff at the Palisades Cliffs, NJ bird of prey photography Canon EOS 1Dx paired with Canon 600mm f/4 IS mark II lens

Peregrine Falcon sticking out its tongue

Peregrine Falcon sticking out its tongue - Northern New Jersey bird of prey photography Canon 1Dx paired with 600mm f/4 IS mark II lens

Peregrine Falcon in flight

Adult male Peregrine Falcon flying at close distance, seen from below, at State Line Lookout, Palisades, Bergen County, NJ  bird photography Canon 1Dx paired with 70-200mm f/2.8 IS + 1.4x extender

Peregrine Falcon

Adult Peregrine Falcon flying by showing its top wings - State Line Lookout, Bergen County, New Jersey bird of prey photography over the Hudson River / Palisades NJ Canon 1Dx paired with 600mm f/4 IS

Peregrine Falcon

Adult Peregrine Falcon flying by with prey hidden under its tail - State Line Lookout, Bergen County, New Jersey bird of prey photography over the Hudson River / Palisades

Juvenile Peregrine Falcon

Juvenile Peregrine Falcon perched on the cliff at the Palisades Interstate Park, Bergen County, NJ bird photography Canon 1Dx paired with 600mm f/4 IS mark II lens

Juvenile Peregrine Falcon

Juvenile Peregrine Falcon flying by at the State Line Lookout, Palisades Interstate Park, Bergen County, NJ

Peregrine Falcon

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

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

Adult Peregrine Falcon in a banking pose at the State Line Lookout, Bergen County, New Jersey bird of prey photography over the Hudson River / Palisades

Juvenile Peregrine Falcon

Young Peregrine Falcon perched on a branch with its wings widespread, Palisades Cliffs, New Jersey nature photography Canon 1Dx 600mm

Peregrine Falcon flying by with prey

Adult female Peregrine Falcon flying with just caught pigeon in its talons at the Palisades Interstate Park, Bergen County, New Jersey wildlife photography Canon EOS 1Dx 600mm f/4 IS mark II

Peregrine Falcon fledgling

Peregrine Falcon fledgling flying by at the Palisades Cliffs in Northern New Jersey  bird photography Canon 1Dx paired with 600mm f/4 IS mark II lens handheld

Adult Peregrine Falcon

Adult Peregrine Falcon flying by at the State Line Lookout, Bergen County, New Jersey bird of prey photography over the Hudson River / Palisades

Juvenile Peregrine Falcon

Close-up of a Juvenile Peregrine Falcon at the Palisades Cliffs in Northern NJ nature photography - Canon 1Dx 600mm f/4 IS mark II

Peregrine Falcon

Adult Peregrine Falcon flying by at the State Line Lookout, Bergen County, New Jersey bird of prey photography over the Hudson River / Palisades