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Cooper's Hawk
Flight feather (Secondary remex)

Cooper's Hawk

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

Family: Accipitridae (Hawks, Eagles, and Kites)

Shape
Broadly rounded tip with a slight asymmetry in the vane width; the trailing edge is wider than the leading edge.
Size
Estimated 7-9 inches (18-23 cm) in length; width approximately 1.5-2 inches. This is consistent with the mid-to-inner secondary feathers of an adult specimen.
Rarity
Common; one of the most frequently encountered raptors in suburban North American environments.
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Description

A medium-sized hawk specialized for high-speed maneuvering through dense foliage. Adults have blue-gray backs and rufous-barred underparts. This feather displays the classic 'accipiter barring' used for camouflage when the bird is perched in shadows.

Colour & Pattern

Bold horizontal banding (barring) of dark brownish-charcoal and crisp white-to-pale-grey. The tip is dark with a thin white terminal margin. The dorsal side is highly pigmented, while the ventral side is paler and more matte.

Barb Structure

Mostly pennaceous and tightly interlocked with developed hooklets; the base transition shows loose plumulaceous barbs (downy section) near the calamus.

Texture & Surface

Smooth and stiff to the touch; the surface is matte with no iridescence. The leading edge is slightly more rigid than the trailing edge to maintain aerodynamic integrity during flight.

Key Features

Distinctive thick dark bars alternating with white, rounded tip (unlike the more pointed primaries), and a relatively straight rachis compared to a tail feather.

Habitat

Woodlands, forest edges, and increasingly common in leafy suburban areas where bird feeders attract their prey.

Geographic Range

Found throughout North America, from Southern Canada to Northern Mexico. Northern populations are migratory, while southern birds are often year-round residents.

Ecological Role

Apex avian predator in woodland ecosystems; helps regulate songbird and small mammal populations. They are excellent indicators of forest health.

Similar Species

Sharp-shinned Hawk (smaller, thinner barbs) and Northern Goshawk (larger, greener/grayer hue, more vermiculated pattern in adults).

Interesting Facts

Cooper's Hawks are 'true hawks' or 'accipiters.' They primarily hunt other birds in flight and were historically nicknamed 'Chicken Hawks,' though they rarely hunt poultry.

Condition Notes

Good condition; minor ruffling near the plumulaceous base. No visible fault bars or heavy specialized wear, suggesting it was molted naturally during a standard cycle.