National Geographic Society

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The hermit crab supplements its own body armor by living inside empty mollusk shells.  As the crab grows, it finds a new fortress.  But theres a problem.  Some predators can suck a crab out of its armor.  The hermit crab needs a body guard.  The sea anemone.  Its armed with microscopic coiled harpoonspumping paralyzing venom. The anemones terrifying tentacles are prefect for attack, and defense.

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In the animal kingdom, it's an evolutionary arms race between attack and defense. Nat Geo WILD is counting down the animals with the top 10 security systems.