A Leach’s spider crab (Inachus phalangium) is hidden among the poisonous tentacles of a Mediterranean snakelocks sea anemone (Anemonia sulcata) in the small bay of Dilesi at South Evoikos Gulf. This is one of the most characteristic symbiotic relationships observed on the Greek seas. The crab finds protection from bigger hunters in the toxic tentacles of the anemone and in the same time it lurks hidden, ready to attack tiny shrimps of the Mysidae family, which live in flocks around the anemone. On the other hand, the anemone seems to benefit from the presence of the crab as the tentacles get cleaned from algae and debris.