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Peregrine falcon

life science Maturity 7-9 Next article →

The peregrine falcon (*Falco peregrinus*) is a highly successful bird of prey, often called a raptor.

Peregrine Falcon La Cañada
Peregrine Falcon La Cañada

It is a large falcon, roughly the size of a crow, and is famous for its incredible speed. This species is the most widespread raptor on Earth. It lives in nearly every part of the world, from the Arctic tundra to the tropics. The only major ice-free landmass where it is entirely absent is New Zealand. Because they can live in so many places, they are among the most widely found wild bird species.

PeregrineSubspeciesMap
PeregrineSubspeciesMap

These falcons have evolved specific physical traits to help them hunt.

Peregrine Falcon (male)
Peregrine Falcon (male)

Their diet consists almost exclusively of medium-sized birds. However, they will sometimes hunt small mammals, small reptiles, or even insects. A key feature is the notched upper beak. This notch is an adaptation that allows the falcon to kill prey by severing the spinal column at the neck. Another fascinating feature is the malar stripe. This is the patch of black feathers located below the eyes. A 2021 study suggested this stripe helps improve vision by reducing sunlight glare.

PeregrineTubercle
PeregrineTubercle

Peregrine falcons show a high degree of sexual dimorphism. This means that males and females look different in size. While they share similar markings and plumage, the females are considerably larger. A female can be up to 30% larger than a male. In most subspecies, males weigh less than 750 grams. Females often weigh more than 1,000 grams. In some cases, females can weigh about 50% more than their male breeding mates. Their plumage usually features a blue-grey or slate-grey back and white underparts with dark bars.

Audubon-peregrinus
Audubon-peregrinus

History shows how humans have interacted with these birds for centuries. The English ornithologist Marmaduke Tunstall first described the species under its current name in 1771. The scientific name, *Falco peregrinus*, uses Medieval Latin. It translates to "wandering falcon," which refers to the migratory habits of northern populations. The term *Falco* is related to the word for "sickle." This refers to the silhouette of their long, pointed wings during flight. Throughout many eras, peregrines have served as religious, royal, or national symbols. They are also well-respected in falconry due to their high trainability and hunting ability.

Falconry sport of kings (1920) Peregrine falcon striking red grouse
Falconry sport of kings (1920) Peregrine falcon striking red grouse

There are many different subspecies of the peregrine falcon.

Peregrine falcon (Australia)
Peregrine falcon (Australia)

Scientists currently accept between 18 and 19 regional subspecies. These birds vary in appearance based on their environment. For example, the American peregrine (*F. p. anatum*) is found in the Rocky Mountains. The Mediterranean peregrine (*F. p. caucasicus*) is non-migratory and lives near the Caucasus. In the Sunda Islands, the subspecies *ernesti* has very dark, dense barring on its underside. In the past, some groups like the Barbary falcon were considered separate species. However, they are only 0.6% to 0.8% genetically different. This suggests they diverged recently during the Last Ice Age.

In recent history, the peregrine falcon faced a serious threat from human activity. The widespread use of pesticides, especially DDT, caused populations to become endangered in many areas. This chemical caused significant harm to the species. Fortunately, the ban on DDT starting in the early 1970s allowed for a recovery. Populations have grown again thanks to large-scale protection of nesting sites. Humans have also helped by releasing captive-bred birds into the wild. This recovery shows how conservation efforts can help a species bounce back from the brink.

Today, the peregrine is a successful example of urban wildlife. They have adapted to living near humans by using tall buildings as nest sites. These structures act like the natural cliffs they would use in the wild. In cities, they find an abundance of prey, such as feral pigeons and ducks. Feral pigeons are a major food source for many urban peregrine populations. Because pigeons are so abundant in cities, they support many falcons in these settings. This ability to utilize human environments helps the peregrine remain one of the most successful raptors on the planet.

Peregrine Falcon hunting Common Starlings, Rome 243839915
Peregrine Falcon hunting Common Starlings, Rome 243839915
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🖼️ Images & Media (20)
File:Peregrine falcon (Australia).JPG
Peregrine falcon (Australia).JPG
File:Peregrine Falcon La Cañada.jpg
Peregrine Falcon La Cañada.jpg
File:Audubon-peregrinus.jpg
Audubon-peregrinus.jpg
File:PeregrineSubspeciesMap.png
PeregrineSubspeciesMap.png
File:FalcoPeregrinusBabylonicusGould.jpg
FalcoPeregrinusBabylonicusGould.jpg
File:FalcoPeregrinusBabylonicusMaleGallehdari.jpg
FalcoPeregrinusBabylonicusMaleGallehdari.jpg
File:Falco peregrinus ernesti.JPG
Falco peregrinus ernesti.JPG
File:Falco peregrinus nest USFWS.jpg
Falco peregrinus nest USFWS.jpg
File:Peregrine Falcon, submelanogenys subspecies, Herdsman Lake near Perth, Western Austraila.jpg
Peregrine Falcon, submelanogenys...
File:FalcoMinorKeulemans.jpg
FalcoMinorKeulemans.jpg
File:PeregrineTubercle.jpg
PeregrineTubercle.jpg
File:PeregrineFalconSilhouettes.svg
PeregrineFalconSilhouettes.svg

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