A grazing creature with defenses against tug worms is the bill-foot bug. Its toenails resemble duck bills and hold the soft parts of the legs high above. The nails themselves are solid silicon carbide and contain no living tissue. No tug worm can penetrate them. To eat, food is grasped in the bill-nails and raised to the mouth. Bill-foot bugs have three backbones arranged with the central backbone higher than the outer two and the single digestive tract running down the middle equidistant from all three of them. They can reach up to two meters in length.
Written by Daniel Noe, WayOutLife.com