Table 9. Center of mass (CM) calculations for S. aegyptiacus.

There have been four estimates for the location of CM in flesh models of S. aegyptiacus using four different points of origin as a reference. Because three were based on an adult flesh model, we convert the one study based on a subadult (number 3) to reflect its position in an adult flesh model: “x” is the distance anterior tothe origin, and “y” is the height above the ground, both in cm.

No.	Author/result	x-origin	x	y	Notes
1	Ibrahim et al., 2014; quadruped	Hip joint	>81	–	Based on an adult flesh model, no coordinates given, CM shown graphically under D10 and said to be anterior to hip/knee joints at a distance greater than femur length (MeshLab calculation error)
2	Henderson, 2018; biped	Tip of tail	8,850	100	Based on an 3D mesh model based on the adult skeletal model of Ibrahim et al., 2014 with estimated length 16 m long; y-coordinate origin is ‘lowest point of axial body’
3	Ibrahim et al., 2020b; quadruped	‘Cranial rim’ of acetabulum	72.5–82.5 (adult = 95.7–108.9)	–81 (adult: 106.9)	Based on a flesh model of the subadult neotype with femur length of 62.5 cm (actual 61.0 cm); y-coordinate measures to substrate
4	This paper; biped	Apex of the acetabulum	15.3	–240	Based on an adult flesh model with avian-style internal air spaces and femur length of 81.0 cm; y-coordinate measures to substrate