Tooth fracture frequency in gray wolves reflects prey availability.

The difference approaches significance in the 4–6 year-old age class (p=0.08) and is highly significant (p<0.01) for the 7+ year-old age class.

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For the analysis of the effects of age on tooth fracture and wear stage, linear regressions of the number of teeth broken against age for all individuals were performed to test for differences among populations, but results did not achieve significance due to a lack of normality and substantial scatter in the data ( Figure 4—figure supplement 1 ).

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