Are Turtles Made of Beef?

Recently, while unlocking the secrets of mock turtle soup, it occurred to me that I have no idea what real turtles are made of.
The question isn't as silly as it might sound, after all--most animals seem to be made of meat. Chickens in particular, are made of poultry, cows are made of beef, and many varieties of fish are made of seafood.
After much grueling research (http://en.wikipedia.org/wiki/Turtle), I am pleased to report that turtles are made of a substance known as crema de tortuga, which is used in countries with flexible legal systems as a primary ingredient in cosmetics.