Table 1. Attributes of the taxonomic sample used in the current study.

Genus	Species	Museum	Locomotor Category	Demographics	Estimated Body Mass (kg)
Alouatta	caraya	AMNH	arboreal quadruped, climber	M: 4, F: 9	5.79 (0.96)a
Homo	sapiens	PSU	biped	M: 10, F: 10	60.86 (6.41) b
Macaca	fascicularis	MCZ	arboreal quadruped	I:19	4.07 (0.92) c
Pan	troglodytes, verus, schweinfurthii	AMNH	terrestrial quadruped, climber	M: 11, F: 4, I: 2	50.13 (10.22) d
Papio	anubis, cynocephalus, hamadryas, ursinus	AMNH,NMNH	terrestrial quadruped	M: 2, F: 4, I: 5	18.25 (4.72) c
Pongo	pygmaeus, abelii	NMNH	quadrumanous, climber	M: 5, F: 2	65.70 (21.50) e
Trachypithecus	cristatus	MCZ	arboreal quadruped	I: 21	5.92 (0.80) f
Symphalangus	syndactylus	NMNH	brachiator	M: 3, F: 4	10.77 (2.48) e

Length and body mass data presented as: mean (standard deviation).

NMNH: National Museum of Natural History (Smithsonian Museum), Washington, USA; American Museum of Natural History, New York, USA; PSU: Norris Farms Collection, Pennsylvania State University, Department of Anthropology, MCZ: Museum of Comparative Zoology, Harvard University.

M: Male, F: Female, I: Indeterminate.

Body Mass Estimation Equations:

^aHaplorhine: 2.729*LN(FemHeadSI)+1.42) (SEE  = 0.239) [66].

^bFemale: (2.426*FemHeadAP-35.1)*0.9 (SEE  = 17.5); Male: (2.741*FemHeadAP-54.9)*0.9 (SEE  = 13.7) [68].

^cCercopithecine: (2.389*LN(FemHeadSI)-4.541))*1.014 (SEE  = 0.1670) [67].

^dAll hominoids: (3.019*LN(FemHeadSI)-6.668))*1.006 (SEE  = 0.1137) [67].

^eAsian ape: (3.024*LN(FemHeadSI)-6.718))*1.008 (SEE  = 0.1309) [67].

^fColobines: (2.424*LN(FemHeadSI)-4.684))*1.01 (SEE  = 0.1385) [67].