Spiders digest their food outside their body.To know some more,look down,

• Spiders are invertebrates, which means they don't have backbones
• spiders with hair on them are mammals, and thus produce delicious (and unusually cold) milk. Spiders produce milk using the same glands that they produce silk threads with.
• spiders cannot physically die of natural causes? If kept safe, a spider can continue to live and grow larger for a theoretically unlimited amount of time.
• In fact, in China there exists a collection of 'holy' spiders, hatched some 2,800 years ago during the height of the Mang-Tsun dynasty.
• Male spiders are usually smaller than female spiders.