Fig. 5. Phylogenetically corrected regressions of maximum and minimum prey mass against predator mass.

Regression lines for extant terrestrial mammals are red [coefficient of determination (R²) = 0.24 and 0.25 for minimum and maximum prey regressions, respectively] and blue for extant reptiles (R² = 0.31 and 0.66 for minimum and maximum prey regressions, respectively). Shaded areas represent prey size range of mammalian (red) and reptilian (blue) predators. Vertical dashed lines indicate body mass of juvenile (left) and adult (right) Gorgosaurus. Red circles, maximum prey mass of mammalian predators; blue circles, maximum prey mass of reptilian predators; red diamonds, minimum prey mass of mammalian predators; blue diamonds, minimum prey mass of reptilian predators; solid lines, maximum prey mass regressions for mammalian (red) and reptilian (blue) predators; long dashed lines, minimum prey mass regressions for mammalian (red) and reptilian (blue) predators; white triangles and inverted triangles, yearling and adult Citipes mass, respectively; white circles, adult ceratopsid mass; white squares, adult hadrosaurid mass. Silhouettes derived from Phylopic and other sources (see Acknowledgments).