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Author Title Year Publication Serial Volume Pages
Heinrich, B.; Bugnyar, T. Just how smart are ravens? 2007 Scientific American 4101 296 64-71
Kozarovitskii, L.B. [Further comment on the distinction between humans and animals] 1988 Nauchnye Doklady Vysshei Shkoly. Biologicheskie Nauki 2800 42-45
Rilling, M.E.; Neiworth, J.J. How animals use images 1991 Science Progress 2831 75 439-452
Shettleworth, S.J. Animal behaviour: planning for breakfast 2007 Nature 356 445 825-826