FIG. 3 in Pennaraptoran Theropod Dinosaurs Past Progress And New Frontiers

FIG. 3. Example of a bivariate scaling equation for femur length (D.J. Field, unpublished data) illustrating virtually invariant scaling equations for flying (blue) and flightless (pink) extant bird taxa. Datasets such as this will be useful for estimating live body mass for extinct avialans with unknown flying potential.