The life of a hermit crab is one of repetition. Find an abandoned snail shell. Live in it. Nom on some flecks of detritus. Grow bigger. Find a slightly bigger shell. Repeat all steps for the rest of your crustacean life. The most onerous part is continually upgrading the shell, a process that can get pretty intensely competitive with other crabs around. However, a newly-discovered species of hermit crab avoids the shell renting game altogether, opting to reside in a living coral, one that grows alongside the crab, meaning no more relocating once the square footage gets a bit tight.