Do Dolphins Sleep? Questions and Answers about the Sea.

K-12 MIT Sea Grant website
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Crabs
Q:With their skeltons on the outside, how do crabs grow?
A: Crabs grow by periodically shedding, or molting, their shell. Sometimes crabs will eat their own old shells, which have lots of calcium and are nutritious. During a lifetime of about one and one-half years, a blue crab will molt about 20 times.

Other questions related to crabs:

How do the boy and girl crabs tell each other apart?