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Cooper's Hawk (also known as Big Blue Darter, Chicken Hawk)
Tail feather (rectrix), likely one of the outer or central retrices

Cooper's Hawk (also known as Big Blue Darter, Chicken Hawk)

Kingdom: Animalia, Phylum: Chordata, Class: Aves, Order: Accipitriformes, Family: Accipitridae, Genus: Accipiter, Species: A. cooperii

Family: Accipitridae (Hawks, Kites, Eagles, and Old World Vultures)

Shape
Symmetrical to slightly asymmetrical vane with a rounded tip, featuring clear, evenly spaced dark horizontal bands.
Size
Approximately 7 to 9 inches long, consistent with a medium-sized accipiter tail feather. Retrices for this species typically range between 6 to 10 inches depending on sex.
Rarity
Common, widely distributed and frequently adapted to suburban environments.
Learn more about Cooper's Hawk (also known as Big Blue Darter, Chicken Hawk) in the encyclopedia →

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Description

A medium-sized hawk known for its stealthy flight through dense timber. It features rounded wings and a long, rounded tail with distinct dark bands, perfectly adapted for rapid acceleration and agile navigation.

Colour & Pattern

Alternating bands of dark chocolate brown/slate grey and pale whitish-grey or buff. The tip is tipped with white, and the underside shows a slightly muted version of the dorsal pattern.

Barb Structure

Pennaceous vane with tightly interlocked barbs and barbules along the shaft, transitioning to a small plumulaceous tuft at the base. Intact and in good condition.

Texture & Surface

Stiff, smooth, and matte finish with a rigid vane capable of withstanding air resistance during high-speed aerial maneuvers.

Key Features

Distinctive bold dark and light banding across the width of the feather, a white terminal tip on the outer tail feathers, and a sturdy, pale central rachis.

Habitat

Deciduous and mixed forests, open woodlands, wooded suburbs, river groves, and forest edges where they hunt medium-sized birds and mammals.

Geographic Range

Year-round resident across most of the United States, southern Canada, and parts of Mexico. Northern populations migrate to Central America for winter.

Ecological Role

Apex avian predator helping regulate populations of medium-sized birds and small mammals, serving as an important indicator of woodland ecosystem health.

Similar Species

Sharp-shinned Hawk (smaller with a square or notched tail tip) and Northern Goshawk (larger, with more pronounced white supercilium and heavier barring).

Interesting Facts

Cooper's Hawks are exceptional aerial acrobats, capable of high-speed chases through dense tree branches and can compress their wings to navigate tight spaces.

Condition Notes

Good condition with intact barbs, clean rachis, and no visible fraying, fault bars, or parasitic damage.