When it detects a significant threat, the Boxer crab will pack a powerful punch using sea anemones attached to its claws. They look like pom-poms, but they can be deadly to other sea creatures and they have a strong sting. The crab waves his claws around when disturbed, to ward off danger.
There is a mutual agreement with the two organisms as they both benefit from the arrangement. The boxer crab gains an awesome defense mechanism that would put most other animals to shame, and the anemone becomes mobile and is able to obtain more food. The crab also uses sponges and corals in place of the anemone.