Hermit crabs and sea anemones have a symbiotic relationship, meaning they live in harmony together. It’s a stable connection that sidesteps the typical prey and predator relationship found in nature. The type of symbiosis they engage in is called commensalism. Commensalism means one organism benefits and the other organism isn’t harmed by the partnership. Neither the hermit crab nor the sea anemone is negatively affected by their symbiotic and commensalistic relationship.