[1] Duke Univ, Nicholas Sch Environm, Durham, NC 27708 USA
[2] Univ British Columbia, Fac Forestry, Dept Forest Resources Management, Vancouver, BC, Canada
[3] Duke Univ, Dept Stat Sci, Trinity Coll Arts & Sci, Durham, CA USA
[4] Univ Stirling, Sch Nat Sci, African Forest Ecol Grp, Stirling, Scotland
[5] Max Planck Inst Anim Behav, Dept Ecol Anim Soc, Constance, Germany
[6] Univ Konstanz, Ctr Adv Study Collect Behav, Constance, Germany
[7] Duke Univ, Trinity Coll Arts & Sci, Dept Biol, Durham, NC USA
[8] Omar Bongo Univ, Libreville, Gabon
[9] Agence Natl Parcs Nationaux, Libreville, Gabon
[10] Inst Rech Ecol Trop, Libreville, Gabon