См. Caroline Albertin et al., «The Octopus Genome and the Evolution of Cephalopod Neural and Morphological Novelties», Nature, 524 (2015): 220–224.
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См. Christelle Jozet-Alves, Marion Bertin, and Nicola Clayton, «Evidence of Episodic-like Memory in Cuttlefish», Current Biology, 23, no. 23 (2013): R1033–1035. Образцом для них послужило исследование на птицах: Clayton and Dickinson, «Episodic-like Memory During Cache Recovery by Scrub Jays», Nature, 395 (2001): 272–274.