Large fish, such as tuna, sturgeons, and even sharks, rank among dragon turtles' favorite foods, but being omnivores, they also sometimes feed on large undersea fields of seaweed. They certainly aren't above supplementing their diets with the passengers of ships they sink, although such feeding is not borne of any intrinsic evil or cruelty. Dragon turtles possess shells 15 feet in diameter, with their appendages stretching a few feet further, and measure over 25 feet long from the tip of their noses to the ends of their powerful tails.