Notes: The tentacles are just the tip of the anemone. To shield itself from grit, this delicate creature makes a tough leathery tube, sinking it two feet (.6 m) deep into the sand.

When a predator like the barber slug comes by to clip off its tentacles, the anemone retreats quickly down the tube—sometimes pulling the slug in with it! Luckily, an anemone's tentacles can grow back after such attacks.