Quote Originally Posted by jackie
That is too cool.

They swap shells? What do they look like when fully out of their shell?

*googling furiously*
Like Christmas_Hamster said, as they grow they have to move into bigger shells. Also, they like to shell shop...looking for just the right shell, so it's good to offer a selection.

Here's what they look like out of the shell:

http://www.thecrabbagepatch.com/crabanatomy.html