1. Volume 19, Issue 22, Pages 1965-1968 (December 2009)
The Role of Experience in Problem Solving and Innovative Tool Use in Crows 
Auguste M.P. von Bayern, Robert J.P. Heathcote, Christian Rutz, Alex Kacelnik 
Current Biology 
Volume 19, Issue 22, Pages (December 2009)
DOI: /j.cub
Copyright © 2009 Elsevier Ltd Terms and Conditions

2. Figure 1 Experimental Apparatus and Setup
(A) provides a schematic representation of the apparatus and the setup on the white plastic table in the experimental room. (B) and (C) show the modifications of the apparatus for the two experimental groups during the experience phase. (B) depicts the apparatus with a rimmed square plate mounted around the mouth of the tube, which was used during the training of the stone-nudging group. (C) shows the apparatus with a shortened tube (through which the birds could reach the platform), which was used during the training of the platform-pushing group.
Current Biology  , DOI: ( /j.cub )
Copyright © 2009 Elsevier Ltd Terms and Conditions