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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 landing in slow motion

Peregrine Falcons mating

Juvenile Peregrine Falcon

Close-up of a young Peregrine Falcon flying by showing its juvenile plumage and tail feathers

Juvenile Peregrine Falcon motling into adult plumage

Juvenile Peregrine Falcon motling into adult plumage

Gray Gyrfalcon

Gray Gyrfalcon, rare bird for New Jersey, flying above the Hudson river at the State Line Lookout, NJ

Juvenile Peregrine Falcon

Look from below on young Peregrine Falcon flying over the Hudson River at State Line Lookout, New Jersey

Fledgling Peregrine Falcon

Fledgling Peregrine Falcon perched on a weathered branch

Juvenile female Peregrine Falcon

Juvenile female Peregrine Falcon (Falco peregrinus) transitioning to adult plumage, perched on a dead, weathered branch hanging off the cliffs at the Palisades Interstate Park, New Jersey

Peregrine Falcon

Dorsal view of an adult Peregrine Falcon flying at the State Line Lookout, Palisades Interstate Park, Bergen County, New Jersey

Juvenile Peregrine Falcon

Juvenile Peregrine Falcon looking over the shoulder / wings while perched at the edge of a cliff at Palisades Interstate Park, State Line Lookout, Bergen County, NJ

Juvenile Peregrine Falcon

Juvenile Peregrine Falcon

Juvenile Peregrine Falcon

Juvenile Peregrine Falcon

Peregrine Falcon

Adult male Peregrine Falcon with a fall colors in the background - resting on a branch at the State Line Lookout, Palisades Interstate Park, NJ

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

Adult male Peregrine Falcon with a fall colors in the background - resting on a branch at the State Line Lookout, Palisades Interstate Park, NJ

Peregrine Falcon

Peregrine Falcon flying above the Hudson River as seen from the top at the Stateline Lookout, Bergen County, NJ

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 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 in-flight as seen from above

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