Some hermit crabs have an unusual relationship with the sea anemone. The sea anemone has stinging cells that sting or even kill those sea creatures that come into contact with it; however, the hermit crab can carry sea anemones on its shell. And even when the hermit crab changes shells, the sea anemone will often transfer to the new shell. This relationship works for the benefit of both creatures. The sea anemone eats the crab’s left-over food particles, and the hermit crab gains protection from predators, as well as some camouflage, from the sea anemone.
CLASS: Malacostraca (crabs, krill, pill bugs, shrimp, and relatives)
ORDER: Decapoda (crabs, shrimp, and relatives)
FAMILY: Paguridae (marine hermit crabs)
GENUS/SPECIES: About 500 species in more than 30 genera
Size: Varies depending on species
Diet: Worms, plankton, organic debris
Habitat: Most waters worldwide