Individual study: Impact of cattle grazing on nesting success of dark-eyed juncos Junco hyemalis at Kaibab National Forest, Arizona, USA
Walsberg G.E. (2005) Cattle grazing in a national forest greatly reduces nesting success in a ground-nesting sparrow. The Condor, 107, 714-716
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Exclude grazers from semi-natural habitats
A study in May-July of 2000 and 2001 in Kaibab National Forest, Arizona, USA (Walsberg 2005), observed significantly higher fledging success rates of ground-nesting dark-eyed Juncos Junco hyemalis breeding in areas not grazed by cattle (48% of 21 nests) than in immediately adjacent, grazed areas (12% of 17 nests). The authors suggest that reduced nest cover may expose nests to more extreme climatic conditions and make them more conspicuous to predators.