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7. Sand tiger

Photo: LOIC VENANCE/AFP
Photo: LOIC VENANCE/AFP (Getty Images)

Sand tiger sharks are pretty metal, being known for their intrauterine cannibalism—the shark’s embryos eat one another in utero until only one remains. The animals also have a voracious appetite once born and are known to eat other shark species alongside a comprehensive diet of fishes, eels, crustaceans and mollusks.