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Octopuses have been observed carrying coconut shells in what researchers claim is the first recorded example of tool use in invertebrates.
veined octopuses, Amphioctopus marginatus, have been filmed picking up coconut halves from the seabed to use as hiding places when they feel threatened.
behaviour qualifies as tool use for a number of reasons. First, the shells are not permanent homes like those occupied by hermit crabs, but are carried around for future use.