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15 remarkable animals that use tools

By: Bryan Nelson on Oct. 28, 2009, 10:09 a.m.
A small common octopus in an aquarium tank

Photo: Henner Damke/Shutterstock

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The octopus has been heralded as the most intelligent invertebrate on the planet, and its use of tools is often improvised. This little guy is carrying two halves of a shell with him; when threatened he closes the shells over him to hide. Similarly, the Blanket octopus has been known to tear off tentacles from a jellyfish and wield them as a weapon when attacked.