Evolution alone is an amazing thing – but species that evolve together can be all the more spectacular, protecting, feeding and cleaning one another in incredible ways. Sharks pair with fish, fish with shrimp and shrimp with sea cucumbers and much much more. From boxing crabs that wield poisonous anemones as weapons to shrimp that scour the mouths of electric eels, here are seven of the most radical symbiotic relationships from the shallowest to the deepest waters of our world.
Boxing, hermit and other crabs have found that they make friends with strange benefits in various species of stinging sea anemones. Boxing crabs (above, top) hold on to anemones and wield them like deadly pom-poms, warding off potential predators with their poisonous pals. Some hermit crabs (above, bottom) lift anemones and attach them to their shells in order to dissuade attackers. These relationships go both ways: the anemones are able to pick up more food as they move through the water with their shelled allies.
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