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Table 1 Annual estimates of wolves reported by USFW, elk availability (elk per wolf), deer availability (deer per elk), cow elk to calf ratios, and mean snow depth in the Southern Yellowstone Ecosystem, WY, USA, followed by the percentage of elk and deer that constituted cougar diets, the percentage of the total elk killed that were calves, and the percentage of kill sites found in forested habitat for summer seasons

From: Recolonizing wolves influence the realized niche of resident cougars

Year Wolves Elk/wolf Deer/elk Cow:calf Snow depth (cm) % elk % deer % calves % forest
2002 15 997.07 0.012 20 72.29 n/a n/a n/a n/a
2003 19 708.26 0.014 28 67.87 86.7 13.3 42 60
2004 15 915.33 0.006 26 77.51 63 18.8 60 78.1
2005 36 350.28 0.008 22 82.7 n/a n/a n/a n/a
2006 30 428.50 0.007 25 69.68 26.3 68.8 40 68.6
2007 58 220.29 0.008 25 89.57 68.1 28.6 50 70
2008 81 155.33 0.004 27 78.22 9.9 63.4 60 82.2
2009 74 169.59 0.002 20 56.61 53.3 33.3 64 83.3
2010 91 128.47 0.010 21 92.93 16.3 63.8 50 95.4
2011 85 140.92 0.008 17 54.9 41.7 52.8 100 76.4
2012 83 144.36 0.002 25 60.11 27.3 69.8 83 79.1