The Boxer Crab
See those little pom-pom looking things on the boxer crabs claws? Well, those are actually sea anemones that the boxer crab uses to pack a powerful punch to its enemies. The anemones have a strong sting which can be deadly to some sea creatures. It’s a mutually beneficial arrangement for the crab and his pom-pom buddies, who gain the advantage of becoming mobile and can find food far easier as a result.