Cephalopods are able to control their arms sophisticatedly and use them for various behaviors, such as camouflage, startling predators and hunting prey. Here, we report a previously undescribed arm-flapping behavior of the pharaoh cuttlefish, Sepia pharaonis, observed in captivity. S. pharaonis raised the first pair of arms and wrinkled the parts near the distal end, where the skin color was darkened. Additionally, S. pharaonis spread the second and third pairs of arms and bent them as if they were jointed, and flapped the distal ends. S. pharaonis showed this behavior in two different situations: after being introduced into a large space, and during hunting. We discuss the putative functions of this behavior, including possible mimicry of a hermit crab, considering the situations in which the behavior was observed.

中文翻译：

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法老乌贼的独特挥动手臂行为，棕褐色法老：推定的寄居蟹模仿

头足类动物能够巧妙地控制自己的手臂，并将其用于各种行为，例如伪装、惊吓掠食者和捕猎猎物。在这里，我们报告了以前未描述的法老乌贼棕褐色法老乌贼在圈养中观察到的挥动手臂行为。S. pharaonis 抬起第一对手臂，将靠近远端的部分起皱，皮肤颜色变暗的地方。此外，S. pharaonis 将第二对和第三对臂展开并将它们弯曲成关节状，并拍打远端。S. pharaonis 在两种不同的情况下表现出这种行为：被引入大空间后和狩猎期间。我们讨论了这种行为的假定功能，包括可能模仿寄居蟹，考虑到观察到行为的情况。