
American Kestrel (Sparrow Hawk)
Kingdom: Animalia, Phylum: Chordata, Class: Aves, Order: Falconiformes, Family: Falconidae, Genus: Falco, Species: Falco sparverius
Family: Falconidae (Falcons and Caracaras)
- Shape
- Asymmetrical, elongated, and pointed toward the distal end. The leading edge (outer vane) is much narrower than the trailing edge (inner vane), which is typical for secondary or inner primary flight feathers to assist in aerodynamic lift and steering.
- Size
- Approximately 4.5 to 5.5 inches (11.5–14 cm). This size is highly consistent with the primary or secondary feathers of a small raptor like the American Kestrel.
- Rarity
- Common; it is the most widespread and smallest falcon in North America, though populations have seen declines in certain regions recently.
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Description
This is a flight feather from North America's smallest falcon. The American Kestrel is a colorful raptor, roughly the size of a Mourning Dove. Males feature blue-grey wings (matching this feather) and rufous backs, while females are primarily rufous with heavy barring. They are known for their habit of perching on wires and hovering over fields.
Colour & Pattern
Slate grey to blue-grey ground color with distinctive, large oval white spots on the inner vane. This 'spotting' or partial banding is a hallmark of kestrel wing plumage, especially visible in males and juveniles.
Barb Structure
Pennaceous and tightly interlocked along the upper two-thirds, providing a stiff surface for flight. The base becomes plumulaceous (downy) near the calamus (quill) for thermal insulation.
Texture & Surface
Smooth, stiff, and matte. The surface is streamlined to reduce air resistance, with a slightly waxy feel common in raptors for water resistance.
Key Features
Blue-grey base color with bold, white oval spots on the trailing vane; small size for a raptor feather; stiff flight-ready structure.
Habitat
Open country, grasslands, meadows, deserts, and urban areas. They require open space for hunting and cavities (natural or man-made boxes) for nesting.
Geographic Range
Widely distributed across North and South America, from Alaska and Canada to the southernmost tip of South America. Most North American populations are migratory.
Ecological Role
An essential secondary consumer and meso-predator, controlling populations of large insects, small mammals, and occasionally small birds.
Similar Species
Merlin (Falco columbarius) feathers are similar but usually darker with more linear banding rather than distinct white ovals. Sharp-shinned Hawk (Accipiter striatus) feathers have different color tones and broader banding.
Interesting Facts
Kestrels are one of the few raptors that can see ultraviolet light, which allows them to track the urine trails of voles and mice across fields like a glowing map.
Condition Notes
Fair to Good. There is significant fraying and separation of the barbs ('zipped' barbs becoming 'unzipped') along the lower trailing edge, suggesting this may be a molted feather that has spent time on the ground or suffered moderate wear.