well a hermit crab is much more cuter and you can tell by the names so my advice well just look up firs a hermit crab than a rock crab on google images
Actually They are called rock crabs, Because they are Crabs born with rocks on there back -Actually, there are lots of types of crabs that live on rocky platforms in intertidal beach zones that are...
I totally agree that this is a different question to the other one. But rock crabs, despite their obvious name, are actually fine with sea water, but they need to breathe a little once in a while....