Yes. Some more often than others.
I doubt it.
Simply, a "shell change".
A hermit crabs abdoman is long and soft. They insert it into the shell, and wrap it around the inside. They can change out of it any time they want.
There shell
Their shell
a shell...
What I know of that is hermit crabs will eat snails. However, hermit crabs will often use an empty shell of a sea snail.
some crabs, like hermit crabs
They aren't; they need a shell.
break the shell just kiddin
To change into a new shell or to mate. If not for these reasons, it is very sick
No