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Macphail, E. M., & Boldhuis, J. J. (2001). The evolution of intelligence: adaptive specializations versusgeneral process. Biological Reviews, 76(3), 341–364.
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Schmidt, J., Scheid, C., Kotrschal, K., Bugnyar, T., & Schloegl, C. (2011). Gaze direction – A cue for hidden food in rooks (Corvus frugilegus)? Behavioural Processes, 88(2), 88–93.
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