How do hermit crabs and sea anemones form a partnership?

Hermit crabs and sea anemones often form a mutualistic symbiosis that provides distinct advantages to both partners. In these associations, the sea anemone benefits from transportation as the hermit crab moves through its environment, and it may also steal food from the crab. In return, the anemone uses its stinging nematocysts to protect the crab from predators like octopuses and other crabs.12

The partnership is maintained in several ways:
* Transplantation: Some hermit crabs actively move their anemone partners from an old shell to a new one when they outgrow their current home.12
* Initiative: In other instances, the anemone takes the initiative by somersaulting from an abandoned shell onto the crab's newly occupied one.1
* Deep-sea adaptation: Certain deep-sea anemones can actually form the shells in which their crab partners dwell, creating a permanent bond where the survival of one is often linked to the other.1

This relationship highlights the complex ways invertebrates interact within marine ecosystems to enhance their survival.12