Invertebrate
A collective term for animals without a backbone, including insects, molluscs, and crustaceans, which together make up most known animal species.
In 2009, a veined octopus was observed carrying coconut shells and using them as shelter—the first documented tool use by an invertebrate. Octopuses can also solve puzzles, open jars, escape aquariums, and learn by watching other octopuses.
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