Mollusks are members of the invertebrate phylum Mollusca and contain more than 100,000 species. Some mollusks have shells like clams and snails, while larger mollusks have no bones at all like the cuttlefish, squid and octopus.
More Animals Topics to Explore:
Cone snails are marine animals that harpoon their prey and incapacitate them with deadly toxins. They may be beautiful, but they are highly venomous.
Looks can be deceiving. That's definitely true for the blue-ringed octopus. It's tiny, stunningly beautiful and looks harmless. Yet its venom could kill 26 men in minutes.
Proactive sluggishness, along with the ability to squeeze into tight spaces, keeps these slugs safe from predators like birds, toads and, well, fires.
By Katie Carman
How giant squid process visual information has long been a mystery, but a new study finds their visual processing is surprisingly uncomplicated.
Mining rare minerals from the breeding ground of these newly discovered creatures could endanger their habitat. But hey, then we get batteries.
Despite its cartoonish visage, yes, this is a real animal. This recently spotted stubby squid was so charming he inspired poetry.
Scientists until recently believed Octopuses & Co. were colorblind. If that were the case, how could the animals create such vivid physical color displays?
The sea butterfly snail moves in Arctic waters in the same way as fruit flies through tropical air. This case of convergent evolution was uncovered by a new study.
Imagine that someone is pursuing you down a dark alley. Do you run? Duck behind a trash bin? The mimic octopus doesn't sweat this kind of scenario: It just shape-shifts to disguise itself. You'll be surprised by the tricks it's got up its tentacles.
Squid have been featured in sailing myths and legends for more than 300 years. They're swift, agile and surprisingly intelligent creatures with brains larger in proportion to their bodies than most fish and reptiles have. Learn about all squid, squid anatomy and how big squid can can actually get.
By Stephanie Watson
Oysters can create pearls from a single grain of sand. How exactly does an oyster create a pearl, and what is the difference between a natural pearl and a cultured pearl?