You have eaten , haven't you? If not, I am sorry for you, because I am considered a very fine-tasting sea food.  
When a is brought to the dinner table it is a bright red. But when it swims in the ocean, before it is boiled, its shell is very dark, almost black.
 
Mother Nature furnished me with a hard shell made of lime. This protects my soft body from my enemies. This shell fits me as tightly as your Sunday kid glove fits you. When............