What is the difference between "soft and hard shell crabs"?

"Natural Soft Shell Crab "•high protein levels and minerals

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What is the difference between "soft and hard shell crabs"?

They are the same species.

A soft-shell crab is a crab that has just discarded its shell.

Immediately after the molt, when the old hard shell has been shed, the crab's new shell is pliable and easily stretched.  Now the crab is called a "soft crab" or a "soft shell crab".

Large amounts of water are consumed prior to and shortly after the molt, causing the soft shell to expand and increase in size. This entire process takes 2-3 hours and within 2 hours after the shed, the new shell begins to harden.

Crabs which have just shed their shell hide in rocks or bury themselves in sand and mud to escape predators.

The "papershell" is formed within 12 hours and an additional 2-3 days are needed before the shell fully hardens.

They come back out after the new shell hardens.