All eight arms of an octopus can be used for whatever their cephalopod owner wishes, but some arms are favored for certain tasks.
A new, detailed analysis of how octopuses wield their famously flexible appendages suggests that all eight arms share a skill set, but the front four spend more time on exploration and the back four on movement. The findings, published September 11 in Scientific Reports, provide a comprehensive accounting of how subtle arm movements coordinate the clever invertebrates’ repertoire of behaviors.
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