Likely Northern Harrier (marsh hawk); exact species uncertain

This is a barred raptor flight feather, most consistent with Northern Harrier, a slim, long-winged hawk with a distinctive owl-like facial disk and buoyant, low quartering flight. Adults are sexually dimorphic: males are gray above, females and juveniles largely brown.

Rich chocolate-brown with alternating pale buff/cream transverse bars, strongly visible on both vanes; the narrow outer vane is paler and the rachis whitish.

Dense, tightly interlocked pennaceous barbs with intact barbules; no owl-like fringes or conspicuous aftershaft.

Straight, moderately stout, pale rachis; barbs are densely packed and create crisp dark-and-light banding, with some fading toward the tip.

Smooth, firm, and slightly glossy, with the rigid surface typical of a flight feather.

Wing, inferred from the asymmetrical vane, stiff shaft, and broad aerodynamic surface.

Broad chocolate-brown vane, repeated buff barring, pale shaft, and harrier-like length and structure. Exact identification from one detached feather is not definitive.

Northern Harriers use open farmland, prairie, marsh, grassland, and sagebrush; they hunt low over vegetation and nest on the ground.

Breeds across much of Canada and the northern United States, including Idaho, and winters through the United States into Mexico and Central America.

Aerial predator of voles, mice, small birds, and insects, helping regulate agricultural rodent populations. It is generally widespread but depends on intact grassland and wetland habitat; populations respond to prey abundance and habitat loss.

Red-tailed Hawk feathers are usually broader and more heavily mottled; Rough-legged Hawk feathers tend to show stronger pale backgrounds and darker terminal markings. Short-eared Owl feathers are softer and fringed, not sleek and stiff.

Northern Harriers locate prey partly by hearing and can detect rodents beneath vegetation; they often fly only a few feet above fields.

Raptor feathers have cultural importance in many Indigenous traditions, but possession of most native North American raptor feathers is restricted under U.S. law; do not retain or trade this specimen without authorization.

In Caldwell farmland, search field margins, fence lines, and communal roost areas, especially after late-summer or autumn molt. Photograph in scale and compare multiple wing feathers; submit questionable raptor feathers to a wildlife agency or museum.

Apparently fully grown and naturally molted; moderate tip and edge wear, no obvious fault bars or parasite damage. Condition: Good.

Caldwell, ID in farmland