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How did veined octopuses use coconut shells as portable shelters?
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cephalopod
Blue-ringed octopus (genus Hapalochlaena).
The veined octopus (Amphioctopus marginatus) utilizes coconut shells as portable shelters through a sophisticated behavior recognized by biologists as the first documented instance of tool use by an invertebrate.12
Field observations in tropical waters near Indonesia have shown these octopuses excavating coconut half-shells from the ocean floor. Once retrieved, the octopuses carry the shells with them to serve as mobile protection, providing a ready-made refuge that they can inhabit when needed. This behavior highlights the significant intelligence and complex problem-solving capabilities characteristic of the cephalopod class.12