Yellow-rumped Warbler (Myrtle or Audubon’s Warbler)

This small, highly migratory warbler is gray-brown with bold yellow on the rump, sides, and throat, plus a dark mask. It has a crisp “check” call, active foraging behavior, and a conspicuous habit of flicking its wings and tail.

Dark brown-gray central vane with a vivid lemon-yellow strip along one side and pale gray-white fluffy barbs on the other; the yellow is characteristic of yellow-rumped warbler plumage, though isolated feathers can be misleading

Pennaceous near the tip but increasingly plumulaceous toward the base; barbs are partly frayed, with no obvious specialized owl-like combing

Slender brown rachis, narrowing toward the base; barbs are dense distally and long, loose, and pale basally, with an abrupt yellow pigment area

Soft, lightweight, matte, and somewhat silky; the basal portion is fluffy rather than rigid

Likely flank, breast, or undertail region, inferred from the soft aftershaft and loose basal barbs

Strong yellow pigmentation beside a dark brown-gray vane, small-war­bler scale, and a soft plumulaceous base. Species-level identification from one damaged contour feather remains tentative.

Coniferous and mixed forests, woodland edges, parks, and shrubby habitats; often forages in trees and migrates through open woodland

Breeds across much of Canada, Alaska, and the northern and western United States; winters broadly across the southern United States, Mexico, and Central America

An important insect predator and berry consumer, it links forest food webs and helps indicate habitat quality; the species is widespread but affected locally by habitat loss and climate change.

Yellow Warbler and Palm Warbler may show yellow, but their feathers are usually brighter or differently patterned; Cedar Waxwing feathers are larger and smoother.

Yellow-rumped Warblers can digest waxes in berries, allowing them to winter farther north than many insectivorous warblers.

Wild bird feathers are generally protected from possession under the Migratory Bird Treaty Act in the United States; they should not be collected or sold without authorization.

Compare several feathers from the same site and inspect color under natural light; yellow-rumped warblers commonly molt in late summer and early autumn.

Fair condition: apparently molted, with substantial basal fraying and broken barbs; no clear fault bars, oiling, or parasite damage visible.