Question: what is the difference between land hermit crabs and marine hermit crabs?
Answer: Appearance. Terrestrial hermit crabs have solid-colored legs, most often red or purple. Aquatic hermit crabs, on the other hand, have multicolored, striped or speckled legs. Since they dwell in water, their shells often are covered in barnacles -- something with which their terrestrial counterparts don't have to deal.