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Cooper's Hawk (also known as Big Blue Darter, Chicken Hawk, or Striker)
Tail feather (rectrix), specifically one of the central or lateral rectrices

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

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

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

Shape
Symmetrical to nearly symmetrical vane with a rounded tip and straight margins, typical of an Accipiter tail feather
Size
Approximately 8 to 10 inches long, consistent with a medium-sized raptor tail feather. Tail feathers for this species typically range from 7 to 11 inches depending on sex.
Rarity
Common and widespread throughout its North American range, frequently adapting well to suburban environments.
Learn more about Cooper's Hawk (also known as Big Blue Darter, Chicken Hawk, or Striker) in the encyclopedia →

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Description

The Cooper's Hawk is a medium-sized, highly agile forest-dwelling hawk known for its stealthy hunting style and incredible maneuverability through dense trees. Adults feature steel-gray upperparts, reddish-barred underparts, and a distinctively rounded, long banded tail. Females are noticeably larger than males, a classic case of reverse sexual size dimorphism in raptors.

Colour & Pattern

Striking pattern of alternating dark charcoal-gray or blackish bands and lighter gray-blue bars, terminating in a broad dark subterminal band and a narrow white tip. The ventral side is slightly paler. The rachis is white near the base and transitions to dark gray distally.

Barb Structure

Pennaceous vane with tightly interlocked barbs and barbules featuring hamuli (hooklets) for aerodynamic efficiency. Fluffy plumulaceous down is present at the extreme base. The barbs are intact and well-maintained.

Texture & Surface

Smooth, firm, and stiff with a matte finish. Designed to withstand high friction and air resistance during agile flight maneuvers through dense forest canopy.

Key Features

Distinctive bold dark and light gray transverse banding across the vanes, a rounded tip, and a prominent dark subterminal band followed by a narrow pale or white tip characteristic of Accipiter tail feathers.

Habitat

Deciduous, mixed, and coniferous forests, wooded swamps, river groves, open woodlands, as well as suburban neighborhoods, parks, and golf courses where songbirds and doves are abundant.

Geographic Range

Year-round resident throughout most of the United States and southern Canada, extending south into Mexico. Northern populations migrate to Central America for the winter.

Ecological Role

Apex avian predator in woodland and suburban ecosystems. By preying primarily on medium-sized birds and small mammals, Cooper's Hawks help regulate prey populations and maintain the health and vigor of songbird populations.

Similar Species

Sharp-shinned Hawk (Accipiter striatus) and Northern Goshawk (Accipiter gentilis). Sharp-shinned hawk tail feathers are noticeably smaller (usually under 6 inches) and often have a more squared-off tip. Northern Goshawk tail feathers are larger and feature a heavier, more mottled gray pattern.

Interesting Facts

Cooper's Hawks are master aviators capable of high-speed pursuits through dense timber. They routinely navigate tight spaces by folding their wings and banking sharply, sometimes even flying through narrow gaps at speeds exceeding 30 miles per hour.

Condition Notes

Excellent condition. The feather appears fresh, with intact barbs, no noticeable fraying, fading, or fault bars, indicating it was likely molted naturally during the summer months.