GinaRock Wrens (Salpinctes obsoletus) often build walkways of small stones leading to their hidden nest cavities. Sometimes these pavements become elaborate, with hundreds of objects—including human-made ones—though their true purpose remains a mystery.
https://www.allaboutbirds.org/guide/Rock_Wren
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Rock Wren Overview, All About Birds, Cornell Lab of Ornithology
The small, industrious Rock Wren blends right into its pale grayish brown landscapes of western North America. Rock Wrens constantly hop around rocks, investigating crannies for insects and spiders, which they extract with their delicate bills. This resourceful species thrives even in bleak desert settings occupied by few other birds. Listen for their loud, burry, songs and calls with repeated phrases. Northern and higher-elevation populations move southward, or downslope, for winter.
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