This is makeindex, version 2.14 [02-Oct-2002] (kpathsea + Thai support).
Scanning style file optimal_foraging_theory.gst..........done (10 attributes redefined, 0 ignored).
Scanning input file optimal_foraging_theory.glo....
!! Input index error (file = optimal_foraging_theory.glo, line = 52):
   -- Extra `|' at position 153 of first argument.

!! Input index error (file = optimal_foraging_theory.glo, line = 114):
   -- Extra `|' at position 160 of first argument.
done (121 entries accepted, 2 rejected).
Sorting entries....done (850 comparisons).
Generating output file optimal_foraging_theory.gls....done (272 lines written, 0 warnings).
Output written in optimal_foraging_theory.gls.
Transcript written in optimal_foraging_theory.glg.