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The mollusks or molluscs are the large and diverse phylum Mollusca, which includes a variety of familiar creatures well-known for their decorative shells or as seafood. Mollusks range from tiny snails and clams to the cephalopods (octopuses, squid, etc.), which are considered the most intelligent invertebrates. The giant squid is the largest invertebrate, and, until recently (except for larvae and some recently captured juveniles) had never been observed alive. The colossal squid is likely to be even larger.