Biological and Physical Anthropology Commons^™

Indentation As A Technique To Assess The Mechanical Properties Of Fallback Foods, Peter W. Lucas, Paul J. Constantino, Janine Chalk, Charles Ziscovici, Barth W. Wright, Dorothy M. Fragaszy, David A. Hill, James Jin-Wu Lee, Herzl Chai, Brian W. Darvell, Tony D.B. Yuen

Biological Sciences Faculty Research

A number of living primates feed partyear on seemingly hard food objects as a fallback. We ask here how hardness can be quantified and how this can help understand primate feeding ecology. We report a simple indentation methodology for quantifying hardness, elastic modulus, and toughness in the sense that materials scientists would define them. Suggested categories of fallback foods—nuts, seeds, and root vegetables— were tested, with accuracy checked on standard materials with known properties by the same means. Results were generally consistent, but the moduli of root vegetables were overestimated here. All these properties are important components of what fieldworkers …