Prairie Falcon

The Prairie Falcon (Falco mexicanus) is a large, powerful falcon native to the open country of western North America. Comparable in size to a crow or a Peregrine Falcon, this species is uniquely adapted to life in arid, scrubby grasslands and desert regions. With its sandy-brown plumage, it blends seamlessly into dry environments where it hunts with terrifying speed and agility. While less famous than its globally distributed cousin, the Peregrine, the Prairie Falcon is an equally formidable predator and an iconic symbol of the American West's vast open spaces.

To identify a Prairie Falcon, look for the following key features:

• Plumage: Overall sandy-brown or pale clay-colored upperparts, contrasting with a creamy-white breast and belly that are heavily streaked with brown.
• Underwings: The single most definitive field mark is the stark, dark 'axillaries' (the 'armpits' under the wing) which contrast sharply with the rest of the pale underwing. This is highly visible in flight.
• Facial Markings: A narrow, dark 'mustache' or malar stripe runs down the cheek, much thinner and less pronounced than the thick helmet of a Peregrine Falcon. A thin white line (supercilium) is also visible above the eye.
• Flight Profile: Pointed wings and a long, narrow tail. Its flight is characterized by rapid, shallow wingbeats interspersed with long, direct glides.

Similar Species:

• Peregrine Falcon: Peregrines are darker slate-grey above, have a much broader dark mustache stripe, and lack the contrasting dark axillaries under the wings.
• Merlin: Significantly smaller (bluejay-sized) with blockier wings, lacking the sharp facial markings and dark armpits.

Prairie Falcons are birds of open landscapes. They favor arid grasslands, sagebrush steppes, alpine tundra, deserts, pastures, and agricultural fields of western North America, ranging from southern Canada through the western United States down into northern Mexico.

Unlike many raptors, they do not build nests in trees. Instead, they are strictly associated with cliffs, bluffs, and canyon walls where they find safe ledges for breeding. While some populations in the northernmost parts of their range migrate south to escape harsh winters, many individuals are resident or engage in short-distance nomadic movements to follow prey availability.

Hunting and Diet

Prairie Falcons are incredibly aggressive hunters. Unlike Peregrines, which typically hunt from extreme heights (stooping), Prairie Falcons often hunt using low-altitude contour flights. They fly rapidly just feet above the ground, using hills, bushes, and rocks to conceal their approach before surprising ground squirrels, horned larks, western meadowlarks, or doves. They are also known to hunt on foot for insects and small lizards.

Nesting

These falcons are monogamous and highly territorial. They nest on high, remote cliff ledges, potholes, or steep dirt banks. No nest structure is built; the female lays her eggs directly on a shallow scrape in the dirt or gravel. They will occasionally use abandoned nests of ravens or Golden Eagles located on cliff faces.

Vocalization

During the breeding season, Prairie Falcons are highly vocal around their nesting sites. Their typical call is a piercing, harsh, repeated 'khek-khek-khek' or 'kree-kree-kree' used to warn intruders or communicate with mates.