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Identifying birds when their feathers are wet

feathers are wet
Art by David Sibley

The colors and patterns of feathers provide some of the most important clues we have for identifying birds and are generally quite reliable. Only a few things alter the appearance of feathers. They become worn and faded over time. They can be temporarily shifted out of place, disrupting the typical color pattern and sometimes revealing an unexpected grayish or whitish color of the exposed feather bases.

Feathers can also become stained or discolored by external substances, and the most common of these is simple water. Feathers are water repellent, and water usually just rolls off (like water off a duck’s back), leaving the feather unchanged. When feathers are subjected to a real dousing, some of the water sticks to the feather, and they become wet. This happens most often when water is somehow pressed into the feathers: sparrows pushing through wet grass, doves exposed to an extended heavy downpour of rain, or warblers taking a bath.

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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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