Either way, a steady diet can assist certain crab species in growing to incredible sizes. The biggest crab in the world, the Japanese spider crab, is capable of achieving a leg span of more than ...

And giants they are. Of the 60,000 species of crustaceans on Earth, Japanese spider crabs are the largest, spanning up to 12.5 feet from the tip of one front claw to the other. They’re also one ...