%0 Journal Article %A Seed, Amanda %A Call, Josep %A Emery, Nathan J. %A Clayton, Nicola S. %+ Department of Developmental and Comparative Psychology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society Department of Developmental and Comparative Psychology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society %T Chimpanzees solve the trap problem when the confound of tool-use is removed : %G eng %U https://hdl.handle.net/11858/00-001M-0000-000F-F844-2 %F EDOC: 429658 %R 10.1037/a0012925 %D 2009 %J Journal of Experimental Psychology: Animal Behavior Processes %V 35 %N 1 %& 23 %P 23 - 34