Hermit crabs are a species of crustacean with soft abdomens and live in vacant seashells they find on the ocean floor. As they grow, they need bigger and bigger shells. An interesting phenomenon occurs when a group of different size hermit crabs encounter an empty shell. First, the crabs line up in decreasing size order. The largest crab at the front of the line transitions into the newfound empty shell. The second crab in line then moves into the first crab’s original shell, leaving behind its