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Coconut Octopus (Amphioctopus marginatus)

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description Coconut Octopus (Amphioctopus marginatus) Overview

The coconut octopus, Amphioctopus marginatus, is a small benthic octopus found on sandy and muddy seafloors in tropical Indo-Pacific waters. It is distinguished by dark branching markings and by its documented habit of carrying discarded coconut-shell halves or other hard objects, then assembling them into a shelter when needed. Researchers frequently discuss this behavior as tool use because the animal transports an object for a foreseeable later purpose rather than using it only where found.

help Coconut Octopus (Amphioctopus marginatus) FAQ

Why does the Coconut Octopus carry coconut shells?

Amphioctopus marginatus collects discarded shell halves and transports them across exposed seabeds. It can assemble the pieces into a protective shelter, which is why the behavior is frequently discussed as an example of tool use.

How does a Coconut Octopus walk while carrying its shelter?

The octopus may hold shell pieces beneath its body and move using elongated arms in a stilt-like or bipedal-looking gait. This awkward transport leaves it temporarily exposed but allows the shelter to be used later.

Does the Coconut Octopus only use coconuts?

No, it also uses objects such as clam shells for concealment and protection. Coconut halves became especially conspicuous shelters in human-influenced coastal environments across the tropical Indo-Pacific.

Where can divers look for Coconut Octopuses?

The species is found in tropical Indo-Pacific waters, commonly on sandy or muddy bottoms rather than coral walls. Divers may notice eyes protruding from sediment, an octopus carrying shells, or a shelter assembled from two matching halves.

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