What does the hermit crab share symbiosis with?

Answer 1

Hermit crabs share symbiotic relationship with sea anemones. These invertebrates are covered with stinging cells which explode at the slightest touch. But hermit crabs regularly carry sea anemones around with them, stuck to their shells. In fact, they will often pick up sea anemones and 'plant' them on their backs, and when they move to another shell, will take their resident sea anemone with them!

This co-operation works well for both partners; the sea anemone eats food particles left by the crab, and the crab is protected from its enemies, notably octopuses, by the stinging cells of the sea anemone.