Hermit crab species differ widely from one another. Some are only a few millimeters long, whereas others can grow to be the size of a coconut. Similarly, their life spans can range anywhere between ten and eighty years. On the whole, there are six different families and over 1,000 species of hermit crabs that are contained in the superfamily Paguroidea.
There are over 500 species of hermit crabs, and they are distributed in oceans all across the globe. These interesting crustaceans are commonly found in tide pools and shallow waters, but they may also be found in deeper waters scuttling around on the ocean floor searching for food.