Falco peregrinus
Peregrine Falcon (Falco peregrinus)
Featured photoperegrine-falcon.jpgFalco peregrinus, the peregrine falcon, is a medium-sized falcon of the family Falconidae. Adults are 34 to 58 cm long with a wingspan of 74 to 120 cm and weigh 0.4 to 1.5 kg. The plumage shows a dark slate-grey back, pale barred underparts, and a distinctive black 'moustache' below the eye. The IUCN lists the species as Least Concern after a famous mid-twentieth-century recovery from DDT-driven near-extinction. The peregrine reaches speeds over 320 km/h in a stoop dive, making it the fastest animal in the world.
Quick facts
- Habitat
- Almost any open habitat with cliff or tall-structure nest sites and abundant aerial prey — coasts, mountains, deserts, and (recently) cities with skyscraper ledges. The species is found on every continent except Antarctica.
- Range
- Cosmopolitan. Found on every continent except Antarctica, with breeding populations from arctic tundra to tropical coasts. Several distinct subspecies span this range, varying in size and plumage tone.
- Size
- 34–58 cm body · 74–120 cm wingspan · 0.4–1.5 kg
- Plumage
- Adults show slate-blue-grey upperparts including the head, white-and-buff underparts barred with black, and a sharp dark 'moustache' running from below the eye onto the cheek. The cere and eye-ring are bright yellow; the eye is dark brown. Females are about thirty per cent larger than males — extreme size dimorphism is characteristic of falconids generally.
- Song
- A loud cackling 'kak-kak-kak-kak' delivered from the nest or in territorial display. The call is louder and faster than the similar accipiter cackles.
- Migration
- Highly variable. The arctic 'tundrius' subspecies is one of the longest-distance migrants of any falcon — birds breeding in northern Greenland winter in southern South America. Mid-latitude populations are partial migrants; tropical populations are resident.
- Conservation
- Least Concern (LC)
Overview
Falco peregrinus is one of the most widely distributed of all raptors — found on every continent except Antarctica. The species' name 'peregrinus' is Latin for 'wanderer' or 'traveller', a reference to the long-distance movements documented for several subspecies. The peregrine has been the iconic falconry bird of European, Middle Eastern, and Asian falconry traditions for over four thousand years.
Stoop dive
The peregrine's stoop — a steep folded-wing dive from height onto a flying prey bird — is one of the fastest predator strikes in nature. Tracked stoop speeds of 320 km/h have been verified by GPS and radar studies; some unverified estimates suggest top speeds approaching 390 km/h. The peregrine's nostril contains a small bony cone that diffuses incoming airflow at high speeds, preventing pressure-induced respiratory failure during the stoop. The strike itself is delivered with the closed talons as a glancing blow that stuns or kills the prey on impact.
Conservation history and urban populations
Peregrine populations crashed across the Northern Hemisphere through the mid-twentieth century from DDT-driven eggshell thinning. The eastern North American population was effectively extirpated by the 1970s; recovery required large-scale captive breeding and reintroduction. Urban skyscraper ledges proved excellent artificial cliff equivalents, and modern peregrines now nest on tall buildings in dozens of cities worldwide — feeding on the abundant urban pigeon population. Many cities host webcam-monitored urban peregrine pairs that have become local conservation icons.
Sources & further reading (2)
- iucn-red-list — accessed 2026-04-29
- encyclopedia — accessed 2026-04-29
Frequently asked questions
How fast is a peregrine in a stoop?
Verified GPS and radar measurements of stoop speeds reach about 320 km/h (200 mph). Some unverified historical estimates have proposed top speeds up to 390 km/h, but the highest scientifically-confirmed measurements sit closer to 320 km/h. Either figure makes the peregrine the fastest animal on Earth in any movement context. The stoop itself is a controlled folded-wing dive from height onto flying prey.
Why do urban peregrines nest on skyscrapers?
The peregrine's natural nesting habitat is sheer cliff ledges. Tall city buildings provide an artificial cliff-equivalent — high, vertical-faced, with secure ledges out of reach of ground predators. Urban peregrines also benefit from abundant prey (rock pigeons, mourning doves, starlings) and a relatively warm winter microclimate. Reintroduction programmes from the 1970s onward deliberately released captive-bred peregrines onto city buildings, and many populations have established themselves there ever since.
How does a peregrine breathe at 300 km/h?
Each peregrine nostril contains a small bony cone that diffuses incoming airflow during high-speed dives. Without this structure, the air pressure during a stoop would force air into the lungs faster than the bird could exhale, causing respiratory failure. The same airflow-diffuser principle was later studied for application in early jet engine intake design, where similar high-speed airflow management problems exist.
