Sharks don't have a swim bladder. They rely on their large, oil-filled livers to stay buoyant in the water. In some species, the liver can take up 20% - 28% of the space inside the shark's body.

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What does the shark's liver do?

• The liver contains a low-density oil called squalene, which helps control a shark's depth in the water (buoyancy)

• The liver helps with digestion and fat storage, which allows the shark to go for extended periods without feeding

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