Comparison of tracks between an assumed smolt and assumed predator. Panels (A,B,C) are for the smolt and (D,E,F) for the predator. (A,D) Two-dimensional tracks. (B,E) Distribution of step-length frequencies. (C,F) log10-transformed step lengths versus log10-transformed frequency of step lengths. Solid lines in ( C) and (F) are the linear regression fit to the log-transformed data. The slope of the regression line is the estimate of the Lévy exponent.