Peregrine Falcon in Puerto Rico

How to recognize a Peregrine Falcon

It is a large, powerful falcon, 36 to 48 centimeters long, with the classic silhouette of long, pointed wings. Adults are blue-gray above, pale and barred below, with a dark hood that drops into a thick mustache mark on the cheek. Juveniles are browner above and streaked below, so a first-year Peregrine does not look “blue.”

In flight it gives strong, shallow wingbeats, and the tail is fairly short relative to the wingspan. Females are considerably larger than males, as is typical of bird-hunting raptors. Arctic birds often look paler than temperate ones, a useful detail but not enough to assign subspecies in the field.

What it gets confused with in Puerto Rico

The American Kestrel (Falcón Común) is much smaller, with two thin face stripes, and often hovers over grassland; Peregrines rarely do that. The Merlin (Falcón Migratorio) is 25 to 36 centimeters long, has a dark tail with narrow pale bands, and lacks the Peregrine's bold mustache.

Red-tailed and Broad-winged Hawks have broad, rounded wings, soar in long circles, and lack the sharp wingtip of a falcon. If a raptor circles without flapping for minutes, it is most likely a hawk; if it passes fast and direct with stiff wingbeats, think falcon.

Where to look: coasts, salt flats, and cities

The catalog profile summarizes its habitat as coasts, wetlands, cliffs, and urban and open landscapes. The logic is simple: the Peregrine follows its prey. On the coast it hunts ducks and shorebirds; in cities, pigeons. The southwest is a good starting point: the DRNA management plan for the Boquerón sector lists the Peregrine Falcon among the endangered species identified for the area, alongside Brown Pelican and Yellow-shouldered Blackbird.

The salt flats and lagoons of Cabo Rojo, which the federal refuge describes as an important stop for migratory birds, gather flocks that attract predators. In the San Juan metro area, any tall structure with Rock Pigeons is a logical lookout, but pigeons do not prove a falcon is present: always confirm with a photo or a complete description.

When to see it: the northern non-breeding season

Because the Peregrines that reach the Caribbean breed in the north, the logical window is those populations' non-breeding season, roughly autumn through spring. Many northern Peregrines spend only a few months on their breeding range and spend the rest of the year traveling or wintering farther south, some covering thousands of kilometers.

Do not expect exact dates: a single bird may pass through in a day or stay for weeks where prey is plentiful. Before heading out, check recent eBird reports for your area and always note date, time, and behavior. A record in the middle of the northern summer is not impossible, but it deserves more evidence than one in January.

How it hunts: speed and prey

The Peregrine feeds almost entirely on other birds, and occasionally on bats, caught in midair. Its best-known technique is the stoop from great height: Audubon notes it may possibly reach about 200 miles per hour (roughly 320 km/h), placing it among the fastest birds in the world. Prey ranges from songbirds to ducks.

For an observer, the clue is often indirect. If a flock of shorebirds or pigeons suddenly flushes and bunches tightly in the air, look up and along the edges of the sky. A perched falcon also gives itself away: on posts, antennas, ledges, or cliffs with an open view over water or a plaza full of pigeons.

Protection and conservation status

The Peregrine is a classic recovery story. Organochlorine pesticides such as DDT devastated it in North America from the 1940s to the 1970s; after those chemicals were restricted and birds were reintroduced, the Arctic Peregrine was removed from the federal list on October 5, 1994, and the American Peregrine on August 25, 1999. The IUCN now lists it as Least Concern.

Leaving the federal list does not mean losing protection: the 1999 rule states that the Migratory Bird Treaty Act still applies. In Puerto Rico, DRNA management documents have treated it as an endangered species. In practice: do not chase the bird for a photo, do not fly drones near a perched falcon, and share general locations rather than the exact structure where it rests.

Are there Peregrine Falcons in Puerto Rico?

Yes. The Peregrine Falcon reaches Puerto Rico as a migrant visitor from populations that breed in the north, and it is not documented as a breeder on the island. It is seen mainly from autumn to spring along coasts, salt flats, wetlands, and cities.

Where does the Peregrine Falcon live?

It is one of the most widespread raptors on Earth, breeding from the Arctic tundra to the tropics and absent mainly from extreme polar regions, very high mountains, and most tropical rainforests. In Puerto Rico it uses coasts, wetlands, cliffs, and urban areas during its non-breeding season.

How fast does the Peregrine Falcon fly?

In a dive from great height it may possibly reach about 200 miles per hour, roughly 320 km/h, according to Audubon. That is diving speed used to strike prey; in level flight it is much slower.

Does the Peregrine Falcon nest in Puerto Rico?

No nesting is documented in this site's catalog; the species is treated as a migrant. A nesting attempt on the island would be an exceptional finding that should be documented with photos and reported without revealing the exact location.

How do I tell a Peregrine Falcon from an American Kestrel?

By size and face. The Peregrine is 36 to 48 cm long with a thick black mustache; the kestrel is much smaller, with two thin face stripes, and often hovers over grass. Peregrines hunt birds in flight; kestrels eat many large insects.

Is the Peregrine Falcon endangered?

Not globally today: the IUCN lists it as Least Concern after its recovery from DDT, and it left the federal list in 1994 (Arctic) and 1999 (American). It remains protected by the Migratory Bird Treaty Act, and DRNA documents have treated it as endangered in Puerto Rico.