1 arXiv:1408.1906v1 [q-bio.PE] 8 Aug 2014 Randal S. Olson $^{1,5,*}$, Patrick B. Haley$^{2,5,*}$, Fred C. Dyer$^{3,5}$, and Christoph Adami4,5 $^{1}$Computer Science & Engineering Dept., Michigan State University, East Lansing, MI 48824 $^{2}$Computer Science Dept., The University of Texas at Austin, Austin, TX 78712 $^{3}$Zoology Dept., Michigan State University, East Lansing, MI 48824 $^{4}$Microbiology & Molecular Genetics Dept., Michigan State University, East Lansing, MI 48824 $^{5}$BEACON Center for the Study of Evolution in Action, East Lansing, MI 48824 $^{*}$These authors contributed equally to this work E-mail: olsonran@msu.edu, patrick.haley@utexas.edu, fcdyer@msu.edu, adami@msu.edu Article submitted to the Journal of the Royal Society Interface, August 2014. Keywords: group foraging , many eyes hypothesis , anti-predator vigilance , genetic relatedness , reproductive strategy , tragedy of the commons Exploring the evolution of a trade-off between vigilance and foraging in group-living organisms