Highly intelligent marine mollusks including octopuses, squids, and cuttlefish, characterized by tentacles, advanced eyes, and remarkable color-changing abilities. They are active predators with complex behaviors.
From Greek 'kephale' meaning 'head' and 'podos' meaning 'foot', literally 'head-foot', describing how their arms/tentacles emerge directly from their head region. The term was coined in the early 19th century.
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