Figure 1. Distances of Rock Ptarmigan nests (n = 61) and random points (n = 60) from the nearest boulder.
Figure 2. Orientation of Rock Ptarmigan nests from the nearest boulder on: (a) north-east (n = 32) and (b) south-west slopes (n = 16). Radial lines indicate the respective mean orientations 124° and 108° with 95% confidence intervals.
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