When you hear the word “mollusk,” you probably think of a variety of brainless, shelled creatures like clams, oysters, and scallops, or perhaps some slightly more complex creatures like snails. An octopus couldn’t seem more different than these much simpler animals, but they are mollusks too! In fact, all cephalopods, including squid and cuttlefish, are part of the phylum molluska.
This is because cephalopods like the octopus lost their shells during evolution. Without a shell for protection, they had to develop very advanced senses, incredible camouflage abilities, and intelligence that is hardly ever seen in invertebrates.
Did you know this? I’d love to know more fun facts about animals, and I’m thinking of posting one daily. If you have any you’d like to share, drop them in the comments!
10 responses to “Fun Fact of the Day: Octopuses are Mollusks”
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It really is!
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Bloom 
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