Amphioctopus marginatus

Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Order:	Octopoda
Family:	Octopodidae
Genus:	Amphioctopus
Species:	A. marginatus
Binomial name
Amphioctopus marginatus (Taki, 1964)
Synonyms
Octopus marginatus Taki, 1964 Octopus striolatus Dong, 1976

Amphioctopus marginatus, also known as the coconut octopus and veined octopus, is a medium-sized cephalopod belonging to the genus Amphioctopus. It is found in tropical waters of the western Pacific Ocean. It commonly preys upon shrimp, crabs, and clams, and it has a number of unusual behaviors, including bipedal walking and gathering of coconut husks.

Although octopuses often use foreign objects as shelter, the sophisticated behavior of A. marginatus when they select materials, carry and reassemble them, is far more complex.^[4] The researchers define a tool as "an object carried or maintained for future use", and, according to that definition, the behavior of A. marginatus is the first documented case of tool use in invertebrates.^[4][6] While the hermit crab reuses a shell which it maintains,^[7] what makes A. marginatus different from the hermit crab is that A. marginatus collects shells for future use, so when the octopus is transporting the shell, it is not getting any protection from the shell, which is considered highly unusual by the researchers.^[4]