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How Things Really Work on Instagram: "A starfish eats using a unique external digestion system driven by simple mechanics. When it finds prey like a clam, it uses hundreds of tube feet to pry the shell open just enough to start feeding. Then it everts its stomach—pushing it outside its body—to begin breaking down the food externally. This method allows the starfish to digest prey it could never fit into its mouth. Once the soft tissues are liquefied, the stomach absorbs the nutrients and retract