Discrimination of individual hinds by oral (a) and nasal (b) calls in two consequent years. Gray bars indicate values of discriminant function analysis (DFA) and white bars indicate random values, calculated with a randomization procedure. Comparisons between observed and random values and between 2011 and 2012 calls with χ
2 tests are shown by brackets above. The black bar indicates the classification value of 2012 calls with discriminant functions created for 2011 calls.