A recently documented 1-by-1-foot oral tumor in a great white shark and a lesion on the head of a bronze whaler shark reinforce the fact that cancer strikes sharks, too. For 150 years, scientists have known the animals are susceptible to cancer, but a myth suggesting they aren't persists and contributes to the slaughter of millions of sharks annually. Some people falsely believe ingesting the cartilage of sharks helps protect them against cancer. With the new findings, tumors have now been documented in 23 shark species.

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