The biggest crab in the world, the Japanese spider crab, is capable of achieving a leg span of more than 13 feet (4 meters) across. Read on to get better acquainted with the Japanese spider crab ...

Sometimes when a new shell turns up, hermit crabs will form a line, biggest to smallest, to see which animal fits the new shell. The next smallest will take that crab’s hand-me-down home ...

The vast majority of the items the researchers saw the hermit crabs using in the photographs were made of plastic Hermit crabs all over the world, which scavenge shells as armour for their bodies ...