To protect their rather soft bodies.
They live in other creatures shells
Hermit crabs have a soft body that needs to be protected from predators instead of the hard exoskeleton of most crabs. Therefore they use the shells of other animals like snails to protect their soft bodies.
Very few. Because hermit crabs need to remain stationary to molt they need to be kept with their own kind to avoid being cannibalized. Some owners do add rollie pollie bugs to their crab tanks as cleaners and that has proven to be quiet successful.
There are not many hermit crab predators. Their shells protect them. Man is the greatest threat to hermit crabs.
hermit crabs?
Hermit crabs like to be with others, like how other animals like to be. It always nice to have another partner. I had several hermit crabs and they lasted longer than ones with out any other hermit crab.
They live in the abandoned shells of other creatures, and change them as they grow. The asymmetric size of the hermit crabs claws is remarkable.
Hermit crabs and some insects do
Truthfully, other than the obvious (crabs and lobsters), they are closely related to the spider.
Crabs, birds , turtles , sand fleas , hermit crabs, sand dollars , and a lot of other animals in the sea to ;)
Hermit crabs can. It happens when the hermit crab is changing its shell and falls over or when the hermit crab is dead it slides out or falls out of its shell! Sadly they can't always get back in there shells and die.
I'm not so sure if they need a companion, but they certainly enjoy company. If you are getting pet hermit crabs it would be advisable to get three or four, and as hermit crabs aren't too expensive, you should think about it.