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How to use birds’ rump color as a field mark

rump color
Two views of a male Scarlet Tanager: with the wings held loosely at the sides (left), exposing the bright red rump, and with the wings held higher over the rump (right), concealing the red color. Art by David Sibley

A bright and contrasting flash of color on the rump is a prominent feature of many bird species and also a useful field mark. Yellow-rumped Warblers are distinguished from almost all other small songbirds by their contrasting yellow rump patch, and the White-rumped Sandpiper is among a small number of sandpiper species with white rumps, and so on. But the telltale flash of color from the rump feathers of these species can be completely hidden when the birds are perched. Understanding how and when these feathers are visible is critical to using these field marks with confidence.

The rump feathers are body feathers — relatively short and normally shaped feathers growing from the lower back and (with other body feathers) forming a streamlined shell around the entire body. The wings fold up against the sides of the body, for the most part resting on top of this smooth shell of body feathers.

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David Sibley

David Sibley

David Sibley writes the column “ID Toolkit” in every issue of BirdWatching. He published the Sibley Guide to Birds in 2000, the Sibley Guide to Bird Life and Behavior in 2001, and Sibley’s Birding Basics in 2002. He is also the author of the Sibley Guide to Trees (2009), the Sibley Guide to Birds-Second Edition (2014), and guides to birds of eastern and western North America (2016). He is the recipient of the American Birding Association’s Roger Tory Peterson Award for lifetime achievement in promoting the cause of birding and a recognition award from the National Wildlife Refuge System for his support of bird conservation.

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