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Eurasian Kestrel (also known as the Common Kestrel or Old World Kestrel)
Secondary flight feather (remex)

Eurasian Kestrel (also known as the Common Kestrel or Old World Kestrel)

Kingdom: Animalia, Phylum: Chordata, Class: Aves, Order: Falconiformes, Family: Falconidae, Genus: Falco, Species: Falco tinnunculus

AI-generated identification · may be incorrect

Family: Falconidae (Falcons and Caracaras)

Shape
Symmetrical to slightly asymmetrical vane with a rounded to bluntly pointed tip. Overall outline is broad and tapers smoothly toward the distal end.
Size
Approximately 4 to 6 inches in length, consistent with a medium-small raptor flight feather. Typical secondaries for this species range from 4 to 7 inches depending on exact wing position.
Learn more about Eurasian Kestrel (also known as the Common Kestrel or Old World Kestrel) in the encyclopedia →

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Description

The Eurasian Kestrel is a small falcon famous for its distinctive hovering hunting technique. It features rufous-brown upperparts heavily spotted with black, a grey head and tail in males, and sharp, pointed wings adapted for agile flight and hovering over grassy fields.

Colour & Pattern

Warm reddish-brown to chestnut base color prominently marked with dark brown to black horizontal bars and spots. The rachis is a bright, contrasting yellowish-orange or rufous color.

Barb Structure

Tightly interlocked pennaceous vane structure on the distal portion with strong barbicels, transitioning into a slightly looser plumulaceous basal section. Intact barbs with good structural integrity.

Rachis & Barb Pattern

Central shaft (rachis) is relatively robust, highly flexible, and distinctly orange-yellow in color on the upper surface. Barbs are densely packed, angled outward from the rachis, creating a uniform and firm vane surface.

Texture & Surface

Smooth, firm, and slightly glossy on the upper surface with rigid vanes designed to withstand aerodynamic forces during flight.

Feather Placement

Wing, specifically a secondary flight feather. Determined by the moderate length, balanced vane width, and characteristic barred patterning typical of falcon flight feathers.

Key Features

Distinctive warm rufous-brown ground color with bold black transverse bars and a striking yellowish-orange central rachis.

Habitat

Open country, agricultural land, scrubland, moorland, and semi-deserts, frequently found hunting over open fields, meadows, and along highway verges.

Geographic Range

Widely distributed across Europe, Asia, and Africa, with some northern populations migrating to warmer regions in winter while others remain year-round residents.

Ecological Role

Acts as an important apex predator for small mammals and large insects, helping to naturally regulate rodent populations in agricultural and open ecosystems.

Similar Species

Other small raptors and falcons, such as the American Kestrel (Falco sparverius) or Merlin (Falco columbarius), whose feathers share similar barring but differ in exact coloration, size, and rachis hue.

Interesting Facts

Eurasian Kestrels have exceptional eyesight and can see ultraviolet light, allowing them to track the urine trails left by voles and other small rodents across grassland habitats.

Cultural Significance

Historically used in falconry, particularly by beginner falconers (often referred to as a 'mew' hawk or training bird). Feathers have occasionally been used in traditional crafts and fly-tying.

Field Identification Tips

Look for molted raptor feathers in open fields, near old nests, or around rocky outcrops and perches where kestrels frequently hunt and preen.

Condition Notes

Good condition with intact barbs and minimal fraying at the base. Shows natural coloration without significant sun bleaching or structural damage.