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Figure 37. Ruffed grouse drumming surveys in Little Falls Area, 1979-2009. Gaps in the graph<br />

indicate years when the survey was not conducted.<br />

Chart courtesy of Beau Liddell, MNDNR, Division of Fish <strong>and</strong> Wildlife, Little Falls, MN.<br />

Figure 38. Minnesota‟s ruffed grouse drum count index values, 1949-2009. Vertical error bars<br />

represent 95% confidence intervals based bootstrap samples (Larson 2009).<br />

2009 Conservation Program Report<br />

Page 56

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