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The status and apparent decline of Sage-grouse ( Centrocercus spp.) has been of increasing concern and lower nesting success could be contributing to population declines. Our objective was to directly identify Sage-grouse nest predators. Following visual confirmation of radio-marked Sage-grouse nest establishment in 1997-1999, we installed automatic 35 mm cameras controlled by an active infrared monitor. Of 26 nests monitored by cameras, 22 successfully hatched and four were unsuccessful. American Elk ( Cervus canadensis ), Badger ( Taxidea taxus ), and Black-billed Magpie ( Pica hudsonia ) destroyed three of the four unsuccessful nests, and domestic cattle caused abandonment of the fourth. Richardson’s ( Spermophilus richardsonii ) and Thirteen-lined Ground Squirrels ( S. tridecemlineatus ) were recorded at nests, but were not detected in predation.

Direct Identification of Northern Sage-grouse, <em>Centrocercus urophasianus</em>, Nest Predators Using Remote Sensing Cameras