Cephalopods such as squid have eyes with lenses, retinas, and other features just like vertebrates. Some gastropods have a well-developed sense of smell and can find food in the water at a large distance. Predators can also be detected and so the mollusk can avoid them. Some mollusks exhibit complicated mating behavior. Some cephalopods possess an amazing ability to learn from experience.
The mollusk phylum is the second largest phylum in the animal kingdom, after the arthropods. Estimates of the number of mollusk species have sometimes exceeded 100,000.
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