How do clams walk?

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If you've ever seen some clams, mussels, or oysters, you've probably noticed that they live inside special shells that open and close like a big mouth, and seem to enclose the entire creature! So if they live inside of a shell like this, and don't have any arms or legs sticking out the sides like a turtle, how do they get around??

The answer is that it depends on the exact creature. Some types of clams, mussels, and oysters don't spend very much time moving around, while others rely on water movement to take them from place to place. There are also certain types that have been known to crawl or dig. These critters mostly get around using a special slimy "foot" that sticks out the sides of their shell-enclosure when they're ready to move!

Exploration

Behind the shells

Have a grown-up help you find some pictures of these neat creatures online or in a book. Try looking for pictures that show closed shells as well as open ones, or pictures showing the special slimy foot!What are some similarities and differences you notice about each clam, mussel, or oyster you look at? How do you think their shells benefit them? Are there any things you think might be difficult about life in a shell?