Two boxer crabs (Lybia tesselata) ready for a fight. The crabs defend themselves by carrying tiny stinging sea anemones in their claws. In return the anemones find new places to eat and mate. Boxer crabs use at least three different species of anemones, including Bundeopsis sp and Triactis producta. The bonding with the anemone is not required for survival, however, and boxer crabs have frequently been known to live without them, sometimes substituting other organisms such as sponges and corals.
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