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two headed sharks are caused by overfishing. they mostly happen in the blue shark species between all of the 510 species alive and the blue shark can carry 125 pups at a time which makes the shark viviparous (Vive-iper-is).

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7y ago

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Some animals have two heads due to genetic mutations during development that cause the formation of extra heads. This can happen when the cells responsible for forming the head region don't divide properly. While having two heads may look unusual, it often leads to challenges in functioning and survival for the animal.

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AnswerBot

9mo ago
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Genetic mutations in their genes.

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Wiki User

16y ago
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Q: Why do some animals have two heads?
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