Laser scanning and Computer-Aided Design (CAD) software has been used to create volumetric models of a number of non-avian dinosaurs (Fig. 3). This allowed calculation of segment masses, centres of mass and moments of inertia for a best estimate reconstruction. Subsequently an extensive sensitivity analysis has been conducted in which the volumes of body segments and respiratory organs were varied in an attempt to constrain the maximum plausible range of mass values (Fig. 3b). The result is a wide range in actual mass and inertial values (3c), emphasizing the high level of uncertainty in such reconstructions. However, the centre of mass is well constrained below and in front of hip joint in each model.