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A sea monster attacks a ship in an illustration for 20,000 Leagues Under the Sea by Jules Verne.

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Sea Monster Attack

August 2017

This tentacle belongs to a blue button. While it has a central “float” with streaming tentacles like typical jellyfish, the blue button is a colony of many small hydroid animals.

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Blue Button Tentacle

February 2014

A veined octopus sits inside a vacant bivalve shell, which it uses as a portable shelter, in the Philippines. This is one of the few examples—if not the only example—of tool use in invertebrates.

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Veined Octopus at Anilao Batangas Pier, Philippines

August 2017