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[DIGEST: DiscoveryKids, ScienceAlert, Cell, Wired, GenomeResearch, FrontMolNeurosci, NEJM]

A four-year-old octopus may be smarter than a four-year-old child, depending on how you define intelligence and adaptability. Tool use, forethought, reasoning and puzzle-solving skills have all been observed in elephants, chimpanzees, dolphins, birds and octopi.

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